名词
中文翻译：外壳
同义词：
['shell', 'outer shell']
例句：
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1. The ship's outer chamber is filled with water.
这艘船的外壳里装满了水。
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2. The scientist used a new technique to study the outer shell of the planet.
科学家使用一种新的技术来研究行星的外层结构。
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3. The outer shell of the moon is made up of rock and metal.
月球的外层由岩石和金属构成。