名词
中文翻译：风扇效率
同义词：
['fan performance', 'fan effectiveness']
例句：
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1.The new fan is much more efficient than the old one.
这款新风扇比旧的更高效。
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2.The efficiency of the new system has improved significantly.
新系统的效率高了很多。
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3.The fan's efficiency is directly related to its size and weight.
风扇的效率与尺寸和重量直接相关。