Our joint clean energy Research Center is funding new approaches to energy efficiency, clean coal — which we both need to deal with — and clean vehicles.

我们的清洁能源联合研究中心正在提供资金，针对节能、洁净煤——这方面我们两国都需要处理——以及清洁车辆开辟新的途径。

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“A clean bill of health”, “a clean record”, “clean sweep”, or “good clean fun” evoke wholesome flawlessness, renewal or order.

“一份无传染病的健康证书”，“一份干净的记录”，“大胜利”，或“有趣的事”都可以联想到完美无限的健康，重获新生或井然有序。

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Clean once more with clean water, then clean off the floor by water absorption machine and mop.

再用清水清洁一便，然后使用吸水机和拖把将地面请干净。

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Kentuck appeared at the cabin every afternoon in a clean shirt, his face still shining from the washing he'd given it.

VOA: special.2009.06.06

And the way it manifests itself, as you know from just how people talk, is you're compulsive, you're clean, you're stingy.

这种人格表现为，强迫，有洁癖和吝啬，这些都可从人们谈话方式看出。

耶鲁公开课 - 心理学导论课程节选

You know, she's really nice about it. We don't really talk about it, but we're both very clean people,

她这方面很好。我们真的不需要谈论这个，但我们都是很爱干净的人，

布鲁克林的房价 - SpeakingMax英语口语达人

The Clean Water and Clean Air Acts each cost about one per cent of G.

NEWYORKER: The Climate Fixers

Clean water, like clean air, is as important to Americans today as the roof over their heads.

FORBES: Ending China Pollution An Uphill Battle

Taking the place of coal will be clean-burning natural gas and clean, green solar and wind power.

FORBES: Coal Is History. Or Is It?