名词
中文翻译：能量发生器
同义词：
['energy source', 'power source']
例句：
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1.The energy efficiency of the new device is much higher than that of the old one.
这款新设备的能效比旧设备高得多。
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2.The energy efficiency of the new machine is significantly better than that of the old one.
这款新机器的能效显著优于旧机器。
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3.The energy efficiency of the new design is more efficient than that of the old one.
这款新设计的效率比旧设计更高。