In a school in Taiwan each class is a unit of the student body. Each class is led by its homeroom teacher and represented by its class leadership. The class leadership consists of the following class officers: a class leader, a vice class leader, a class secretary, a service crew leader, a class treasurer, and so on.
homeroom teacherhomeroom teacher 指一個班級的班導師。
My sister is bad-tempered and would sap at anybody whenever she feels like it.