请抓紧楼梯把手，小心滑倒。

Qǐng zhuājǐn lóutī bǎshǒu, xiǎoxīn huádǎo.

Please hold the stair handrail tightly and be careful not to slip.

门把手坏了，打不开门。

Ménbǎshǒu huài le, dǎ bu kāi mén.

The door handle is broken, so the door can’t be opened.

这辆自行车的把手有点松，需要拧紧。

Zhè liàng zìxíngchē de bǎshou yǒu diǎn sōng, xūyào nǐngjǐn.

The handlebar of this bicycle is a bit loose and needs to be tightened.