当我在等公交车时，我看到一个无家可归的人拿着一个牌子，上面写着他想喝杯热咖啡。

While I was waiting for the bus, I saw a homeless person carrying a sign which said that he would like a cup of hot coffee.

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在等公交车的时候，我捡到了一个钱包。

While waiting for the bus, I picked up a wallet.

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在等公交车的时候，我捡到了一个钱包。

While waiting for the bus, I picked up a wallet.

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