| 词汇 | ab |
| 词源 | AB; able-bodied seaman. AB stands for an able-bodied sea- man, a first-class sailor who is a skilled seaman and has passed his training as an ordinary seaman. The expression able-bodied dates back to 17th-century England, when apprentices or boys formed the other, inexperienced class among the crews on sail- ing ships. |
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