事故3:跌落

　　A: Marco has fallen off a ladder. I think he's hurt his back. What shall we do?

　　A:马可从梯子上掉下来了。我想他伤了背。我们该怎么办？

　　B:We'd better not move him. I'll get the first-aider.

　　B:我们最好不要挪动他。我去叫急救员。