公共汽车正要出发时,她跳了上去。

公共汽车正要出发时,她跳了上去。

The bus was on the point of departing when she jumped on.

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The bus was on the point of departing when she jumped on.

was on the point of departing:过去式 be 加 on the point of 加 departing,表示交通工具在过去的某个瞬间即将出发。

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