4个数复式三中三有多少组怎么算

简介：In fact, when we arrived in the morning, the weather forecast said it was going to rain. Everyone else had brought umbrellas, but Cheng Keshu and Li Yun did not bring them, so they were a little worried. They were afraid that they would not be able to go home and had to take shelter from the rain at school. But when As soon as school was over, the sky suddenly cleared up, a rainbow spread across the sky, and the rain stopped. It was such a coincidence that it made people happy.