The house looked as if it was about to fall down.
房子看起来好像就要倒塌似的'。
If the blocks are placed off-centre, they will fall down.
积木如果搭得中心错位就会倒塌。
Babies often fall down when they are learning to walk.
小儿学步时常会跌交。
There's nothing to be afraid of. The sky won't fall down.
没有什么好怕的，天不会塌下来。
You are likely to fall down on your research project if you don't go to the experts for advice.
如果你不去向专家们请教，你的研究项目很可能夭折。
