我偶然碰到了他。
One day, however, I ran into him in the street.
然而有一天我在街上碰见了他。
He had forgotten it when I ran into him fifty-five years later.
当我55年后再次碰到他时，他已经忘记了这件事。
Then one day, I ran into him at a conference and saw a changed man.
一天，我参加一个会议，看见他变了。
Then one day, I ran into him at a conference and saw a changed man.
一天，我参加一个会议，看见他变了。
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