名词
中文翻译：后退的磁盘叶轮
同义词：
['recessed disk impeller', 'retracted disk impeller']
例句：
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1. The new design of the machine uses a recessed disk impeller to improve efficiency.
这台机器的新设计使用了凹槽式叶轮来提高效率。
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2.The engineer replaced the old impeller with a recessed one for better performance.
工程师用一个凹槽式的叶轮替换了旧的叶轮，以获得更好的性能。
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3.The recessed disk impeller in the pump is designed to reduce noise and vibration.
泵中的凹槽式叶轮被设计成减少噪音和振动。