1. He's so annoying that nobody wants to talk to him.2. He's being a nuisance by always asking people for help.
 obnoxious; annoying (noun) nuisance普遍又好用.
1. 他很討人厭, 大家都不想跟他說話.2. 他總需要別人幫忙很討人厭.
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 riing sea levels.