因为university的前面u发音【ju】是辅音不是元音，所以用a。
例句：
1、这座城市有没有大学？
Is there a university in this town?
2、皇家学院于1967年获得升格为大学的特许状。
The Royal College received its charter as a university in 1967.
3、大学学位已经成为在大多数行业谋职的必要条件。
A university degree has become a requisite for entry into most professions.
4、新的欧洲研究中心应设在教授所有欧洲语言的大学里才合适。
It is fitting that the new centre for European studies should be in a university that teaches every European language.
5、他的行为与大学教授的身份不相符。
His behaviour is unbefitting of a university professor.
非你莫属88
