门锁看起来很精致。

The ___lock looks elegant.

请确保你离开前把门锁好。

Please make sure you secure the ___lock before leaving.

记得出门前把门锁好。

Remember to ___lock the door before you leave.

船只必须通过水闸才能在不同高度的运河段之间通行。

Boats must pass through the ___lock to move between canal sections at different heights.

我的自行车链条卡住了，完全动不了。

My bike chain ___was locked and wouldn't move at all.