Don’t be taken in by your enemy.
狗和牡蛎
The Dog and the Oyster
一只狗很喜欢吃鸡蛋。一天，他看到一个牡蛎，误以为是鸡蛋，就一口吞了下去。一会儿之后，他就感到胃里疼痛难忍。说道：“我真是自作自受啊！我不加分辨地把一切圆的东西都看做鸡蛋。”
如果事前没有充分考虑，可能会陷入难以意料的危险。
A Dog used to eating eggs，saw an Oyster and，opening his mouth to its widest extent，swallowed it down with the utmost relish，supposing it to be an egg. Soon afterwards suffering great pain in his stomach，he said，“I deserve all this torment，for my folly in thinking that everything round must be an egg.”