exempt是什么意思

　　例句：

　　1、Some students are exempt from certain exams.

　　有的'学生可免除某些考试。

　　2、The interest on the money is exempt from tax.

　　这笔钱的利息免税。

　　3、His bad eyesight exempted him from military service.

　　他因视力不好而免服兵役。