Before my parents died I didn't spend much time with them. Now that they are gone, I realized I didn't cherish the time with them until I lost them.
 One doesn't cherish something until they lose it. You never miss the water till the well runs dry.是成語, 不那麼普遍, 不過意思明瞭, 大家都聽得懂. 通常指你使用一個唾手可得的東西, 不知道它的存在, 直到有一天它快用完才知道珍惜.
我父母在世時沒有好好陪他們, 他們不在時我才知道珍惜. (各位要好好孝順父母喔)
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 effct, which leads to melting of glaciers, which leads to rising sea levels.