题目内容
船上的救生圈至少一半应带________.At least half of the lifebuoys on board should have ____
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________是供抛投入水让落水者攀扶的个人救生设备。 _____is a personal life-saving device for people falling into water to climb.
很多船舶上的全封闭式救生艇均采用设在船尾的________，这样使用更加方便、安全. The fully enclosed lifeboats on ships use a_____ at the stern, which makes it more convenient and safe.
________是在开敞式救生艇基础上加设刚性的封闭顶盖，以保护乘员不受冷热侵袭。 ______is a rigid enclosed roof attached to the open lifeboat to protect the occupants from cold and heat.
郑和下西洋，比其他国家的航海家早了近千年。Zheng He’s navigation was nearly a hundred years earlier than the navigators of other countries.
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