Energy saving is a traditional topic.
节约能源是一个传统的话题。
Energy consumption reduction has become a hot topic of social problem with the new target of energy saving proposed.
随着节能降耗新目标的提出，节能降耗工作已成为全社会关注的热点问题之一。
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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