他们一起吃过午饭后去了公园。

他们一起吃过午饭后去了公园。

They went to the park after eating lunch together.

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They went to the park after eating lunch together.

`(after) (eating)` 是 after + -ing 构成的非限定从属分句,在句末表示 eating lunch 的时间先于主句动作 went to the park。隐含主语为 they。

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