例句：
I had to run like mad to catch the bus.
为了赶上公共汽车，我不得不拼命跑。
I stopped and waited for her to catch up.
我停下来等她赶上。
He stopped and let her catch up with him.
他停下了，让她赶上自己。
If we leave now, I can catch the earlier flight.
我们要是现在动身，我就可以赶上早一点的航班。
He chased after the burglar but couldn't catch him.
他追赶那个盗贼却没有抓住他。