teacher是可数名词。
teachern.教师；教员；老师；先生；
How well does the teacher structure the lessons?
老师对课程组织安排得如何？
The teacher assigned a different task to each of the children.
老师给每个儿童布置的作业都不相同。
Patience is one of the most important attributes in a teacher.
耐心是教师最重要的品质之一。
