我们应该学会长大，用英语怎么说？

we have to learn to grow up.

We should learn to be mature.

你既然已经长大成人，就得学会独立生活。:

1. Now that you're growing up you must learn to stand on your own two feet.

We should learn to be mature through what we experienced.

或者:
We should learn to grow up through what we experienced.

我们应该在我们所经历过的事情中学会长大.

We should learn to grow up

我是初一的，凭我的感觉应该是We should learn to grow up
但我不知道是否百分百正确，下次帮你去问一下我们老师吧，等着我哦

We should learn to grow up .
最后的“.”也很重要.