During long periods of dry weather, earth which contains lots of clay can crack, as in the picture above. Clay gets bigger when wet and smaller when dry.
英语短语 to crack on 意思是赶快继续吧。这个短语也被用来鼓励一个人赶快行动或开始行动。
We need to crack on and get today's work finished.
A: Can I start moving the boxes into the living room?
B: Yes, crack on.
Crack on 这个短语经常跟介词 with 连用。
I'm going to crack on with my report.
After lunch, they cracked on with painting the kitchen.