an ineffectual teacher

• 不称职的教师

an ineffectual teacher的用法和样例：

例句

1. The court claims she is an unfit mother.
   法庭声称她是不称职的母亲。
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。