名词
中文翻译：流体
同义词：
['liquid', 'liquid substance']
例句：
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1. The engine is designed to operate efficiently in a fluid medium.
发动机设计成在流体介质中高效运行。
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2. The water in the container is a clear fluid.
容器中的水是清澈的流体。
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3. The oil is a fluid that can be used as a lubricant.
油是一种可以用作润滑剂的流体。