I want to eat when I get nervous. I get nervous when I go to the gym to lose weight. It's a vicious circle.
 vicious circle vicious cycle惡性循環 = vicious circle = vicious cycle
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 greehouse effect, which leads to melting of glaciers, which leads to rising sea levels.