deep可以换成deeply吗?两者有何区别?

两者不能互换。

区别：

deep 通常用于距离、空间上的深度；例：The boat sank deep in the lake.

船沉于湖的深处。

deeply 通常用于内心、情感上的深度。Deeply shocked by his friend's sudden death in an accident, he had no interest to go traveling. 他的朋友在一次意外中突然死亡让他极度震动，他已没兴致出门旅游了。

不能。看看下面的例子，也许你会明白。

1. We were deeply moved by his story.

2. They are deeply interested in sports.

3. The hole should be dug deeper.

4. Walking deep into the forest is an unusual experience.