我在五月一日早上离开北京。

I left Beijing on the morning of May 1.

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劳动节在五月一日，这是国际劳动人们的节日。

Labor's day is on May 1, and it is an international day for workers.

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研究的结果发表在五月一日《科学》杂志的在线版上。

The results were published May 1 in the online version of the journal Science.

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研究的结果发表在五月一日《科学》杂志的在线版上。

The results were published May 1 in the online version of the journal Science.

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