Our English teacher is a very learned man.
我们英语老师是个很博学的人.
He konws a lot about American cuiture.
他对美国文化很了解.
或：
He konws a lot of American cuiture.
a lot of 中的of可以省略吗?什么时候省略/
Our English teacher is a very learned man.
我们英语老师是个很博学的人.
He konws a lot about American cuiture.
他对美国文化很了解.
或：
He konws a lot of American cuiture.