n. 铅, 铅条, 领导, 超前量, 领引, 榜样, 主角, 导线

vt. 引导, 带领, 领导, 指挥, 致使, 加铅于, 用铅包

vi. 领导, 带头, 导致, 用测深锤测深, 被铅覆盖

a. 带头的, 最重要的

[化] 铅Pb

Lead \Lead\ (l[e^]d), n. [OE. led, leed, lead, AS. le['a]d; akin
to D. lood, MHG. l[=o]t, G. loth plummet, sounding lead,
small weight, Sw. & Dan. lod. [root]123.]
1. (Chem.) One of the elements, a heavy, pliable, inelastic
metal, having a bright, bluish color, but easily
tarnished. It is both malleable and ductile, though with
little tenacity, and is used for tubes, sheets, bullets,
etc. Its specific gravity is 11.37. It is easily fusible
(melting point 327.5[deg] C), forms alloys with other
metals, and is an ingredient of solder and type metal.
Atomic number 82. Atomic weight, 207.2. Symbol Pb (L.
Plumbum). It is chiefly obtained from the mineral galena,
lead sulphide.

2. An article made of lead or an alloy of lead; as:
(a) A plummet or mass of lead, used in sounding at sea.
(b) (Print.) A thin strip of type metal, used to separate
lines of type in printing.
(c) Sheets or plates of lead used as a covering for roofs;
hence, pl., a roof covered with lead sheets or terne
plates.

I would have the tower two stories, and goodly
leads upon the top. --Bacon

3. A small cylinder of black lead or graphite, used in
pencils.

{Black lead}, graphite or plumbago; -- so called from its
leadlike appearance and streak. [Colloq.]

{Coasting lead}, a sounding lead intermediate in weight
between a hand lead and deep-sea lead.

{Deep-sea lead}, the heaviest of sounding leads, used in
water exceeding a hundred fathoms in depth. --Ham. Nav.
Encyc.

{Hand lead}, a small lead use for sounding in shallow water.


{Krems lead}, {Kremnitz lead} [so called from Krems or
Kremnitz, in Austria], a pure variety of white lead,
formed into tablets, and called also {Krems white}, or
{Kremnitz white}, and {Vienna white}.

{Lead arming}, tallow put in the hollow of a sounding lead.
See {To arm the lead} (below).

{Lead colic}. See under {Colic}.

{Lead color}, a deep bluish gray color, like tarnished lead.


{Lead glance}. (Min.) Same as {Galena}.

{Lead line}
(a) (Med.) A dark line along the gums produced by a
deposit of metallic lead, due to lead poisoning.
(b) (Naut.) A sounding line.

{Lead mill}, a leaden polishing wheel, used by lapidaries.

{Lead ocher} (Min.), a massive sulphur-yellow oxide of lead.
Same as {Massicot}.

{Lead pencil}, a pencil of which the marking material is
graphite (black lead).

{Lead plant} (Bot.), a low leguminous plant, genus {Amorpha}
({Amorpha canescens}), found in the Northwestern United
States, where its presence is supposed to indicate lead
ore. --Gray.

{Lead tree}.
(a) (Bot.) A West Indian name for the tropical, leguminous
tree, {Leuc[ae]na glauca}; -- probably so called from
the glaucous color of the foliage.
(b) (Chem.) Lead crystallized in arborescent forms from a
solution of some lead salt, as by suspending a strip
of zinc in lead acetate.

{Mock lead}, a miner's term for blende.

{Red lead}, a scarlet, crystalline, granular powder,
consisting of minium when pure, but commonly containing
several of the oxides of lead. It is used as a paint or
cement and also as an ingredient of flint glass.

{Red lead ore} (Min.), crocoite.

{Sugar of lead}, acetate of lead.

{To arm the lead}, to fill the hollow in the bottom of a
sounding lead with tallow in order to discover the nature
of the bottom by the substances adhering. --Ham. Nav.
Encyc.

{To cast the lead}, or {To heave the lead}, to cast the
sounding lead for ascertaining the depth of water.

{White lead}, hydrated carbonate of lead, obtained as a
white, amorphous powder, and much used as an ingredient of
white paint.


Lead \Lead\ (l[e^]d), v. t. [imp. & p. p. {Leaded}; p. pr. & vb.
n. {Leading}.]
1. To cover, fill, or affect with lead; as, continuous firing
leads the grooves of a rifle.

2. (Print.) To place leads between the lines of; as, to lead
a page; leaded matter.


Lead \Lead\ (l[=e]d), v. t. [imp. & p. p. {Led} (l[e^]d); p. pr.
& vb. n. {Leading}.] [OE. leden, AS. l[=ae]dan (akin to OS.
l[=e]dian, D. leiden, G. leiten, Icel. le[imac][eth]a, Sw.
leda, Dan. lede), properly a causative fr. AS. li[eth]an to
go; akin to OHG. l[imac]dan, Icel. l[imac][eth]a, Goth.
lei[thorn]an (in comp.). Cf. {Lode}, {Loath}.]
1. To guide or conduct with the hand, or by means of some
physical contact or connection; as, a father leads a
child; a jockey leads a horse with a halter; a dog leads a
blind man.

If a blind man lead a blind man, both fall down in
the ditch. --Wyclif
(Matt. xv.
14.)

They thrust him out of the city, and led him unto
the brow of the hill. --Luke iv. 29.

In thy right hand lead with thee
The mountain nymph, sweet Liberty. --Milton.

2. To guide or conduct in a certain course, or to a certain
place or end, by making the way known; to show the way,
esp. by going with or going in advance of. Hence,
figuratively: To direct; to counsel; to instruct; as, to
lead a traveler; to lead a pupil.

The Lord went before them by day in a pillar of a
cloud, to lead them the way. --Ex. xiii.
21.

He leadeth me beside the still waters. --Ps. xxiii.
2.

This thought might lead me through the world's vain
mask.
Content, though blind, had I no better guide.
--Milton.

3. To conduct or direct with authority; to have direction or
charge of; as, to lead an army, an exploring party, or a
search; to lead a political party.

Christ took not upon him flesh and blood that he
might conquer and rule nations, lead armies, or
possess places. --South.

4. To go or to be in advance of; to precede; hence, to be
foremost or chief among; as, the big sloop led the fleet
of yachts; the Guards led the attack; Demosthenes leads
the orators of all ages.

As Hesperus, that leads the sun his way. --Fairfax.

And lo ! Ben Adhem's name led all the rest. --Leigh
Hunt.

5. To draw or direct by influence, whether good or bad; to
prevail on; to induce; to entice; to allure; as, to lead
one to espouse a righteous cause.

He was driven by the necessities of the times, more
than led by his own disposition, to any rigor of
actions. --Eikon
Basilike.

Silly women, laden with sins, led away by divers
lusts. --2 Tim. iii.
6 (Rev. Ver.).

6. To guide or conduct one's self in, through, or along (a
certain course); hence, to proceed in the way of; to
follow the path or course of; to pass; to spend. Also, to
cause (one) to proceed or follow in (a certain course).

That we may lead a quiet and peaceable life. --1
Tim. ii. 2.

Nor thou with shadowed hint confuse
A life that leads melodious days. --Tennyson.

You remember . . . the life he used to lead his wife
and daughter. --Dickens.

7. (Cards & Dominoes) To begin a game, round, or trick, with;
as, to lead trumps; the double five was led.

{To lead astray}, to guide in a wrong way, or into error; to
seduce from truth or rectitude.

{To lead captive}, to carry or bring into captivity.

{To lead the way}, to show the way by going in front; to act
as guide. --Goldsmith.


Lead \Lead\, v. i.
1. To guide or conduct, as by accompanying, going before,
showing, influencing, directing with authority, etc.; to
have precedence or pre["e]minence; to be first or chief;
-- used in most of the senses of lead, v. t.

2. To tend or reach in a certain direction, or to a certain
place; as, the path leads to the mill; gambling leads to
other vices.

The mountain foot that leads towards Mantua. --Shak.

{To lead off} or {To lead out}, to go first; to begin; as,
Mickey Mantle led off in the fifth inning of the game.
[1913 Webster +PJC]


Lead \Lead\, n.
1. The act of leading or conducting; guidance; direction; as,
to take the lead; to be under the lead of another.

At the time I speak of, and having a momentary lead,
. . . I am sure I did my country important service.
--Burke.

2. Precedence; advance position; also, the measure of
precedence; as, the white horse had the lead; a lead of a
boat's length, or of half a second.

3. (Cards & Dominoes) The act or right of playing first in a
game or round; the card suit, or piece, so played; as,
your partner has the lead.

4. An open way in an ice field. --Kane.

5. (Mining) A lode.

6. (Naut.) The course of a rope from end to end.

7. (Steam Engine) The width of port opening which is
uncovered by the valve, for the admission or release of
steam, at the instant when the piston is at end of its
stroke.

Note: When used alone it means outside lead, or lead for the
admission of steam. Inside lead refers to the release
or exhaust.

8. (Civil Engineering) the distance of haul, as from a
cutting to an embankment.

9. (Horology) The action of a tooth, as a tooth of a wheel,
in impelling another tooth or a pallet. --Saunier.

10. (Music.)
(a) The announcement by one voice part of a theme to be
repeated by the other parts.
(b) A mark or a short passage in one voice part, as of a
canon, serving as a cue for the entrance of others.
[Webster 1913 Suppl.]

11. In an internal-combustion engine, the distance, measured
in actual length of piston stroke or the corresponding
angular displacement of the crank, of the piston from the
end of the compression stroke when ignition takes place;
-- called in full

{lead of the ignition}. When ignition takes place during the
working stroke the corresponding distance from the
commencement of the stroke is called

{negative lead}.
[Webster 1913 Suppl.]

12. (Mach.) The excess above a right angle in the angle
between two consecutive cranks, as of a compound engine,
on the same shaft.
[Webster 1913 Suppl.]

13. (Mach.) In spiral screw threads, worm wheels, or the
like, the amount of advance of any point in the spiral
for a complete turn.
[Webster 1913 Suppl.]

14. (Elec.)
(a) The angle between the line joining the brushes of a
continuous-current dynamo and the diameter
symmetrical between the poles.
(b) The advance of the current phase in an alternating
circuit beyond that of the electromotive force
producing it.
[Webster 1913 Suppl.]

15. (Theat.) A role for a leading man or leading woman; also,
one who plays such a role.
[Webster 1913 Suppl.]

16. The first story in a newspaper or broadcast news program.
[PJC]

17. an electrical conductor, typically as an insulated wire
or cable, connecting an electrical device to another
device or to a power source, such as a conductor
conveying electricity from a dynamo.
[PJC]

18. (Baseball) the distance a runner on base advances from
one base toward the next before the pitch; as, the long
lead he usually takes tends to distract the pitchers.
[PJC]

{Lead angle} (Steam Engine), the angle which the crank maker
with the line of centers, in approaching it, at the
instant when the valve opens to admit steam.

{Lead screw} (Mach.), the main longitudinal screw of a lathe,
which gives the feed motion to the carriage.