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The wretch often disguises himself, but you will know him at once by his rough voice and his black feet.

这个坏蛋常常把自己化装成别的样子，但是你只要一听到他那粗哑的声音和那双黑脚，就能认出他来。

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Have been tested at least once by a third person or party?

至少经过第三人或第三方的一次测试。

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Women who said they were physically active even once a week showed less cognitive impairment as measured by a test.

VOA: special.2010.07.07

You can actually initialize multiple things at once by separating them with a comma, and this is sometimes helpful.

你可以一次性初始化很多东西,通过用逗号分开它们，这有时是有用的。

哈佛公开课 - 计算机科学课程节选

By the way, once again there's a bit of a rift there between Barthes and Foucault. Foucault wouldn't say "quite futile."

顺便说一句，这里巴特和福柯,又有了分歧，巴特不会说“没有希望“

耶鲁公开课 - 文学理论导论课程节选

Carr took on multiple Hollow Men (reanimated corpses) at once by employing different gestures.

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She was done in once by an 11-hour asthma attack and was later thwarted by box jellyfish stings.

CNN: August 20, 2012 -- Updated 1157 GMT (1957 HKT)

While in custody, Jaradat was checked more than once by a doctor, and no medical problems were found.

CNN: Palestinians protest inmate's death, warn Obama