排水暗沟

Spray \Spray\ (spr[=a]), n. [Cf. Dan. sprag. See {Sprig}.]
1. A small shoot or branch; a twig. --Chaucer.

Syn: sprig.

The painted birds, companions of the spring,
Hopping from spray to spray, were heard to sing.
--Dryden.

2. A collective body of small branches, or cut flowers with
long stems; as, the tree has a beautiful spray; many
sprays were sent in condolence to teh funeral home.
[1913 Webster +PJC]

And from the trees did lop the needless spray.
--Spenser.

3. (Founding)
(a) A side channel or branch of the runner of a flask,
made to distribute the metal in all parts of the mold.
(b) A group of castings made in the same mold and
connected by sprues formed in the runner and its
branches. --Knight.

{Spray drain} (Agric.), a drain made by laying under earth
the sprays or small branches of trees, which keep passages
open.