You have to climb up the ladder to reach the roof.

你必须爬上梯子才能摸到屋顶。

youdao

DuDu: Someone is going to climb up the roof. What does he need?

乐乐：有人要爬屋顶。他需要什么？

youdao

DuDu: Someone is going to climb up the roof. What does he need?

乐乐：有人要爬屋顶。他需要什么？

youdao