他紧紧抓住栏杆，害怕掉下去。

Tā jǐnjǐn zhuāzhù lángān, hàipà diào xiàqù.

He held onto the railing tightly, afraid of falling down.

警察很快抓住了那位小偷。

Jǐngchá hěn kuài zhuāzhù le nà wèi xiǎotōu.

The police quickly caught that thief.

上课的时候，要抓住老师说的重点。

Shàngkè de shíhou, yào zhuāzhù lǎoshī shuō de zhòngdiǎn.

When in class, you should grasp the main points the teacher says.