①There is a widespread humorous saying that ______(引入格言). Funny as it is, the saying ironically reflects the fact that ______(名言所反映的事实).
②Our life involves all kinds of obstacles and setbacks which may exhaust us. Therefore, ______ (中心论点). What's more, ______(进一步阐述中心论点). For example, ______(举例论证). Obviously, ______(好出本段结论).
③All in all, ______(结论), just as the old popular saying goes, ______(呼应开头).