A fall into the pit, a gain in your wit

本期涉及谚语：
1）A fall into the pit, a gain in your wit. 吃一堑，长一智。
2）Failure is the mother of success. 失败乃成功之母。
3）A stumble may prevent a fall. 小踬可防大跌。
4）It is a silly fish that is caught twice with the same bait. 蠢鱼才上两回当。