a. 狭窄的
v. 使...收缩(阻塞)

Constrict \Con*strict"\, v. t. [imp. & p. p. {Constricted}; p.
pr. & vb. n. {Constricting}.] [L. constrictus, p. p. of
constringere. See {Constrain}.]
To draw together; to render narrower or smaller; to bind; to
cramp; to contract or cause to shrink.

Such things as constrict the fibers. --Arbuthnot.

Membranous organs inclosing a cavity which their
contraction serves to constrict. --Todd &
Bowman.


Constricted \Con*strict"ed\, a.
1. Drawn together; bound; contracted; cramped.

2. (Bot.) Contracted or compressed so as to be smaller in
certain places or parts than in others.