1. His wife cheated on him; that’s why they got divorced.2. She was having an affair with a married man.
 cheat on somebody have an affair這是最普遍的說法.
他太太有外遇, 所以他們才離婚. 她與有婦之夫外遇.
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 f glaciers, which leads to rising sea levels.