I have learnt a lot about Beijing's past and present.

我了解了许多北京的过去和现在。

youdao

There is a lot that we have not learnt about rainforests.

关于热带雨林，我们还有很多不了解的地方。

youdao

There is a lot that we have not learnt about rainforests.

关于热带雨林，我们还有很多不了解的地方。

youdao