He used to sleep around, but when he reached thirty he began to get his act together.
 sleep around screw aroundscrew around 是比較粗俗的說法, 用 sleep around 就可以了, 表示私生活不檢點
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.