n. 水手长

[ noun ]
a petty officer on a merchant ship who controls the work of other seamen
<noun.person>

boson \bo"son\ (b[=o]"s'n), n.
See {Boatswain}. [Obs.] [Also spelled {bosun}.] --Dryden.


bosun \bosun\ n.
a petty officer on a merchant ship who controls the work of
other seamen; a contraction of {boatswain}. [Also spelled
{bo'sun}.]

Syn: boatswain, bos'n, bo's'n, bo'sun, boson.
[WordNet 1.5]