... watertight electric torch 防水手电筒 watertight envelope 水密外壳 watertight etectric torch 防水手电筒 ...
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It is also part of the watertight envelope, and subject to the local water head.
它也是水密外壳的组成部分,并承受局部水压力。
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The side shell provides the webs for the main hull girder and is an important part of the watertight envelope.
舷侧壳为主体船身纵桁提供网装结构,并且是水密外壳的一个重要部分。
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