Energy saving is a traditional topic.

节约能源是一个传统的话题。

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Energy-saving is eternal theme, so in today's world it has become a hot topic.

节能是永恒的主题，尤其在当今世界已成为热门课题。

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Energy-saving is eternal theme, so in today's world it has become a hot topic.

节能是永恒的主题，尤其在当今世界已成为热门课题。

youdao