随手

出门的时候请随手关灯。

Chūmén de shíhou qǐng suíshǒu guāndēng.

Please turn off the light when you leave.

他随手拿起桌上的杯子喝了一口水。

Tā suíshǒu ná qǐ zhuō shang de bēizi hē le yì kǒu shuǐ.

He picked up a cup on the table and drank a mouthful.

请随手关门。

Qǐng suíshǒu guānmén.

Please close the door behind you.