吸入空气

Snifting \Snift"ing\,
a. & n. from {Snift}.

{Snifting valve}, a small valve opening into the atmosphere
from the cylinder or condenser of a steam engine, to allow
the escape of air when the piston makes a stroke; -- so
called from the noise made by its action.


Snift \Snift\, v. i. [imp. & p. p. {Snifted}; p. pr. & vb. n.
{Snifting}.] [From {Sniff}.]
1. To snort. [Obs.] ``Resentment expressed by snifting.''
--Johnson.

2. To sniff; to snuff; to smell.

It now appears that they were still snifing and
hankering after their old quarters. --Landor.