我们快趁天黑前下山吧。

Wǒmen kuài chèn tiānhēi qián xiàshān ba.

Let’s hurry down the mountain before it gets dark.

我们趁着假期去旅行。

wǒmen chènzhe jiàqī qù lǚxíng.

We travel during the holiday.

他趁着我不注意偷偷走了。

tā chènzhe wǒ bù zhùyì tōutōu zǒu le.

He sneaked away while I wasn't paying attention.