1 实义动词就是行为动词，一点区别也没有。
2 round 和around的意思相近,但用法不完全相同.
我把它们的异同解释如下:
1.在表示"圆形运转,回到原处", "环绕","周围"时,英语用round,但美国人用around, 例如:
The earth revolves round(around)the sun(地球绕太阳运行).
They sat round(around)the table.(他们围着桌子而坐)
New things are happening all round(around) us(新事物在我们周围不断发生)
There is a small restaurant round(around)the corner(绕过街角有一家小餐馆).
2. 美国人以及部分英国人也常用around表示"到处","无目的地","附近","左右"等较为模糊的概念, 例如
The news that President Clinton was coming spread rapidly around the campus(Clinton 总统就要到来的消息很快地就在校园里传开啦)
3.around 还可以表示"不止一处","在许多地方","在不同地方". 但在美国英语里,一般只用around, 例如:
The students are standing around(学生们在到处站着)
They are rushing around in New York.(他们在New York到处奔波).
其实，它们区别不大。只不过round是英式英语around是美式英语
追问那为什么要弄一个行为动词和实义动词，它们之间总该有些不同吧，请说的详细一点