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energy efficiency [3 entries]
  1. energy efficiency    エネルギー効率
  2. to achieve greater energy efficiency    エネルギーの利用効率を上げる
  3. changes in qualities such as durability, energy-efficiency, ease of use, and added features    耐久性、エネルギー効率、使いやすさ、機能の充実などの質の変化
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