THE CRAB AND HIS MOTHER

An Old Crab said to her son, “Why do you walk sideways like that, my son? You ought to walk straight.” The Young Crab replied, “Show me how, dear mother, and I'll follow your example.” The Old Crab tried, but tried in vain, and then saw how foolish she had been to find fault with her child.

Example is better than precept.

螃蟹母子

有一只老螃蟹对自己的儿子说：“儿子啊，你为什么要那样侧着走呢？你应该直着向前。”小螃蟹回答：“亲爱的妈妈，你给我示范一下，我跟你学习。”老螃蟹尝试了半天，结果徒劳无功，然后才意识到自己挑儿子的错是多么愚蠢。

训诫：身教胜于言传。