敲门声 (qiāoménshēng): sound of knocking on a door

Measure Word

一阵敲门声 zhèn

Tūrán chuánlái yī zhèn qiāoménshēng.

Suddenly there came a knocking at the door.

Shēnyè de qiāoménshēng ràng tā xià le yī tiào.

The knock at the door late at night startled her.

敲 qiāo

门 mén

声 shēng