他们却已经不见
But they have already disappeared
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他们说他们帮他装上铝的侧板，并为他买了一张车票；但当他转身道谢的时候，他们却已经不见了。
They said they installed aluminium sidings, and bought a bus ticket for him; but when he turned round to say goodbye, they had gone.
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