Relax is not a waste of time for it can improve your study efficiency.

休息放松并不是浪费时间，因为它可以提高你的学习效率。

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This is the most comprehensive study to date to characterize the efficiency of different filter types.

这是迄今为止，在确认各种不同类型过滤效率方面最为广泛的研究。

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“BSFs were developed in the 1980s, ” says Jellison. “This is the most comprehensive study to date to characterize the efficiency of different filter types.”

“八十年代开发了生物沙子饮用水过滤系统”， 杰利森说，“这是迄今为止全面研究不同效率的饮水系统的特点。”

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Recently Cisco undertook a study of human behavior and the barriers to effective collaboration: how it affects productivity, workplace efficiency, and business results.

FORBES: Connect