二等兵

[ noun ]
a seaman in the merchant marine; trained in special skills
<noun.person>

Seaman \Sea"man\, n.; pl. {Seamen}. [AS. s[ae]man.]
One whose occupation is to assist in the management of ships
at sea; a mariner; a sailor; -- applied both to officers and
common mariners, but especially to the latter. Opposed to
{landman}, or {landsman}.

{Able seaman}, a sailor who is practically conversant with
all the duties of common seamanship.

{Ordinary seaman}. See {Ordinary}.