问不倒博士说:冬天河面上结了一层厚厚的冰,这层冰就像是给河面上盖了一层厚厚的棉被一样,不管外面天气多冷,冰下面的河水都可以保持在4℃左右,所以我们鱼儿可以照样游来游去,不会被冻死,只是没有夏天那么活泼而已。因为水下面是热的,上面是冷的。(徐一子(4岁)因为鱼很聪明,它 Qiao Buluo said: In winter, a thick layer of ice is formed on the river surface. This layer of ice is like a layer of thick quilt covered on the river surface. No matter how cold the outside weather is, the river under the ice can be Keep at about 4 ℃, so we can swim the fish can still swim, will not be frozen to death, but not so lively summer only. Because the water is hot, the top is cold. (Xu Yizi (4 years old) Because the fish is very smart, it