able sea·man 名詞
  二等水兵
  Sea·man n.; pl. Seamen   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.
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  able seaman
       n : a seaman in the merchant navy; trained in special skills
           [syn: able-bodied seaman]