Don't knock them off the wall!

不要把它们从墙上撞下来！

Did he knock on the door first?

他先敲了门吗？

They knock around for the whole morning.

他们整个早上都在闲逛。

They just knock around – for the whole morning!

它们整个早上都在乱飞！

If there are people in the meeting room, you are supposed to knock before entering.

如果会议室里有人，你应该在进入前敲门。

I heard someone knock at the door.

我听到有人在敲门。

Please knock before entering the room.

进入房间前请敲门。

The car almost knock down a pedestrian.

那辆车差点撞倒了一个行人。

They plan to knock down that old building.

他们计划击倒那座旧建筑。

He walked to the door to knock at the door.

他走到门前敲门。