He bad-mouths you very often lately. Did you do something to offend him?
 Bad-mouth say something bad about somebody behind somebody's back; speak ill of somebody behind somebody's backBad-mouth 普遍又好用, 其他的是是白話的說法.
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 melting of glaciers, which leads to rising sea level.