At the beginning of June, they their trip.

在六月初，他们开始了他们的旅行。

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At the beginning of June an event occurred.

六月初发生了一件事。

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In the beginning of June we were reviewing our lessons.

六月初我们正在复习功课。

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In the beginning of June we were reviewing our lessons.

六月初我们正在复习功课。

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