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Generating electricity from natural gas is relatively clean.

从天然气中发电是相对洁净的。

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Generally, the presence of an attendant and a fee means the facilities will be relatively clean.

一般说来，有服务人员和一些收费意味着这些设施会有清洁。

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The United States wants a relatively clean election while it considers whether to send more troops and resources to Afghanistan to fight the Taliban.

VOA: standard.2009.10.28

"This is a pretty, relatively clean area, " Leggett says during a waterside stroll in Norfolk.

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Well it looks like in a relatively clean fight, Nokia has that role with Windows Phone.

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The country still has a prosperous middle class and some relatively clean areas of commerce where it can operate.

ECONOMIST: Britain and East Africa