whenasconj.<古> 然而； 而whenadv.什么时候；当 ... 时conj.然后；可是；当 ... 时pron.什么时候n.时间When is check out time?饱受战火蹂躏的阿富汗When did you move back?战备训练When were you happiest?战备物资等级When do you expect him?七个定居点战争(1752-1756)When will he come back?瓦尔梅马WHEN THE LANDFILL WAS BUILT填埋场何时建设的When will I start work?中阳When is the next class?中焦When is the next train?载物片加温器When an office Romance Ends当一场办公室恋情结束时。

1. You shouldn't let your teeth go,otherwise you'll have to go to the dentist often when you are old.
   你不应该不注意你的牙齿，否则，你老了的时候，就不得不常去看牙科医生。
2. And when you do, you'll fantasize that when you were young, prices were reasonable, politicians were noble and children respected their elders.
   而当你老时，你会幻想，当你年轻时，价格是合理的，政客是高贵的，孩子们尊重他们的长辈。