A man is going to the house of a friend. It is quite far away and so he takes some sandwiches along for his lunch. As he goes along, he says to himself, "My friend is sure to give me a very nice meal (膳食). He is going to give me good wine ( 酒 ) to drink. So what' s the use of these dry sandwiches? " As he says this, he throws (扔) them onto the ground.

He goes on and comes to a river. The river is very deep because of the rain in the past few days. He cannot cross the river. He hopes there is a boat to take him over. So he waits and waits. He waits for a long time. Then the sun begins to set. The man says to himself, "I cannot go to my friend' s house today. I must go home. "

Then he starts for home. Soon he feels very hungry. He wants to have something to eat very much. But he doesn' t have anything. Suddenly ( 突 然 ) he sees dry, dirty and hard sandwiches on the road. He is very happy. He picks ( 捡 ) them up and eats them all. 

Do not throw good things away. You may need them later on (以后).