警察赶到时，小偷已经跑了。

jǐngchá gǎndào shí, xiǎotōu yǐjīng pǎo le.

By the time the police arrived, the thief had already fled.

如果遇到危险，请马上报警，警察会来帮助你。

rúguǒ yùdào wēixiǎn, qǐng mǎshàng bàojǐng, jǐngchá huì lái bāngzhù nǐ.

If you encounter danger, call the police immediately — they will come to help you.

他从小的梦想就是当一名警察。

tā cóngxiǎo de mèngxiǎng jiùshì dāng yì míng jǐngchá.

His dream since childhood has been to become a police officer.