一旦所有人都登上了飞机,门就关上了。

Once everyone was aboard the plane, the doors were closed.

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Once everyone was aboard the plane, the doors were closed.

aboard 是介词,由前缀 a-(表示"在...上")和 board("木板、甲板")组成,原指"在船上",现在泛指"在交通工具上(如飞机、火车等)"。

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