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.
 class officer class leadershipclass officer 指一個班級幹部，class leadership 指全體班級幹部
My sister is bad-tempered and would nap at anybody whenever she feels like it.