The rainwater dripped through a crack on the ceiling.

雨水从天花板的裂缝中滴下。

The rain-water dripped through a crack on the ceiling.

雨水从天花板的裂缝中漏下来。

He was struck with a smart crack on the head.

他头上突然被猛击了一下。

She fell over and got a nasty crack on the head.

她跌倒了，脑袋重重地磕了一下。

If we crack on with the painting we should finish it today.

只要我们拼命干，今天应该就能刷完漆。