1. An empty is not brought down by outside forces; it is brought down by weaknesses from within.2. I just managed to tire out my annoying roommate and now he's sleeping. Let's go out for a drink.
 bring something/somebody down tire somebody out
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 problem. 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 levels.