campus什么时候用可数名词，什么时候作为不可数名词啊？

campus: [ 'kæmpəs ]

n. (大学)校园


词形变化:
名词复数:campuses

例句与用法:
1. The new library was built in the centre of the campus.
新图书馆建在校园的中心。

2. I live on campus.
我住在校园内。

3. A new gymnasium has been built on our campus.
我们大学的校园里新建了一座体育馆。

4. The news soon went round the campus.
消息很快传遍校园。

5. Two suspicious-looking fellows were seen hanging around the campus last night.
昨夜有人看见两个形迹可疑的人在校园里徘徊。



英英解释:
名词campus:

1. a field on which the buildings of a university are situated
还不理解就把他与SCHOOL比较看看两个名词性质有什么区别，其实觉得有时候没有必要这么钻牛角间你，