在一水缸里放进一条大鱼和一些小鱼。贪婪的大鱼就养成了吞食小鱼的习惯。过些时间,在水缸中间插一块玻璃,把大鱼和小鱼隔开。大鱼每次想吃小鱼,总是一头撞在玻璃上,屡屡碰壁,只好“望鱼兴叹”。数日后,突然拿去玻璃,按理大鱼定 Put a big fish and some small fish in a water tank. Greedy big fish to develop the habit of devouring small fish. After some time, put a glass in the middle of the water tank to separate the big fish from the small ones. Big fish every time you want to eat fish, always hit a hit on the glass, repeatedly hit the wall, had “Wang fish sigh ”. A few days later, suddenly take the glass, according to the big fish set