名词
中文翻译：盒子包裹的叶轮
同义词：
['box-sealed impeller', 'box-sealed impeller', 'box-sealed impeller']
例句：
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1. The new impeller is designed to improve the efficiency of the machine.
新的叶轮设计用来提高机器的效率。
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2.The impeller was replaced due to its poor performance.
由于表现不佳，叶轮被替换了。
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3.The impeller's design is a key factor in determining the machine's overall performance.
叶轮的设计是决定机器整体性能的关键因素。