名词
中文翻译：后向弯曲叶片风扇
同义词：
['backward-curved blade', 'backward-curved fan']
例句：
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1. Thenew backward-curved blade fan is more energy efficient than the old one.
这款新的后向弯曲叶片风扇比旧的更节能。
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2.The engineer designed a backward-curved blade fan that could reduce noise levels in the factory.
这位工程师设计了一款后向弯曲叶片风扇，可以在工厂中降低噪音水平。
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3.The backward-curved blade fan was used to cool down the air in the room during the summer.
这款后向弯曲叶片风扇在夏天被用来给房间降温。