When You Are Old的用法和样例：
例句
- 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。 - 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。
