a bad teacher

• 不称职的教师

a bad teacher的用法和样例：

例句

1. An incompetent teacher sterilizes the young mind.
   一个不称职的教员把青年人的思想弄得贫乏枯竭起来了。
2. Success is a lousy teacher .It seduces people into thinking they can't lose.
   成功是个不称职的教师，它是人认为自己不可能失败。