名词词性。
n. 教师导师
The teacher told us to be careful when we cross the road.
这位老师叮嘱过我们过马路要注意安全。
She's a very capable teacher.
她是一位能力很强的教师。
He was a failure as a teacher.
他当教师并不成功。
As a teacher， he's a disaster.
他当老师压根儿就不称职。
My son is working as a teacher.
我的儿子是当老师的。
