The Crab and His Son

A Logical Crab¹ said to his Son, “Why do you not walk straight forward? Your sidelong gait is singularly ungraceful.”

“Why don’t you walk straight forward yourself,” said the Son.

“Erring youth,” replied the Logical Crab, “you are introducing new and irrelevant² matter.”

1 crab   

n.螃蟹，偏航，脾气乖戾的人，酸苹果；vi.捕蟹，偏航，发牢骚；vt.使偏航，发脾气

参考例句：

• I can't remember when I last had crab.我不记得上次吃蟹是什么时候了。
• The skin on my face felt as hard as a crab's back.我脸上的皮仿佛僵硬了，就象螃蟹的壳似的。

2 irrelevant   

adj.不恰当的，无关系的，不相干的

参考例句：

• That is completely irrelevant to the subject under discussion.这跟讨论的主题完全不相关。
• A question about arithmetic is irrelevant in a music lesson.在音乐课上，一个数学的问题是风马牛不相及的。