名词
中文翻译：Unknown
同义词：
['naval rating', 'naval rank', 'military rank']
例句：
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1. The captain of the ship has a navy grade of three stars.
这艘船的船长有一个海军等级三颗星。
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2. He was promoted to a higher navy grade.
他晋升为更高的海军等级。
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3. The new recruits are assigned to the lowest navy grade.
新兵被分配到最低的海军等级。