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
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to mlting of glaciers, which leads to rising sea levels.