当警察到达时
When the police arrived
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当警察到达时，他们让乘客们下车并呆在远处。
When the police arrived, they told the passengers to get off the bus and stay far away.
youdao
当警察到达时，他已毁了所有的证据。
When the police arrived, he had already destroyed all the evidence.
当警察到达时，小偷已经跑掉了。(跑掉早发生)。
When the police arrived, the thief had already run away.
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