Long long ago, an old woman has two sons, Dalong and Xiaolong. Dalong sells(卖) shoesand Xiaolong sells umbrellas.
The old woman says,"I don't like rainy days." Dalong can't sell shoes well. I' m not happy. I don't like sunny days. Xiaolong can't sell umbrellas well. I'm not happy, neither."An old man says, "Don't be worried. You should think(思考)like this. On rainy days, Xiaolong can sell umbrellas well. On sunny days, Dalong can sell shoes well."
"You are right! " The old woman is happy now.