professors是什么意思

　　例句：

　　He was made professor at the age of 40.

　　他40岁时成为教授。

　　University professors both teach and undertake research.

　　大学教授既要教学又要从事研究工作。

　　The television debate was moderated by a law professor.

　　这场电视辩论由一位法学教授主持。