5．refer to 指的是，提到；参考；涉及

　　6．keep an eye on 监视

　　7．date back 追溯到

　　8．by nature 天性的，生性的

　　9．no doubt 无疑，很可能

　　10．after all 终究；毕竟

　　1．What if some married people have affairs?

　　如果有些已婚的人有婚外情怎么办呢？

　　[句式分析]　What if ...？要是......怎么样？what引导的主句为省略形式。

　　[佳句赏析]　要是他不来怎么办？

　　What if he doesn't come?

　　2．Nowadays, the word "hutong" has come to mean more than just the alleys that connect the courtyards.

　　现在，"胡同"这个词不仅仅指连接四合院的小巷子。

　　[句式分析]　come to do sth.表示"开始做某事，逐渐做某事"。

　　[佳句赏析]　总有一天，你会认识到你的错误的。

　　Someday, you'll come to know your mistakes.

　　3．By connecting people's homes, the hutongs in fact connected people's lives, whether the lives of the rich or the lives of the ordinary citizens.

　　胡同不仅使家家户户相通，实际上不论是富人还是穷人，他们的生活都被胡同联系起来了。

　　[句式分析]　whether ... or ...连接两个并列部分，表示"是......还是......；不论......还......"。

　　[佳句赏析]　不管她是赢还是输，这是她的最后一次锦标赛。

　　Whether she wins or loses , this is her last tournament.

As we all know, Beijing is famous for its hutongs and the Great Wall. If you visit Beijing, which one do you want to visit best and why?