冰刀为什么能在冰上滑起来？

Ice looks hard and cold. 冰看着又硬又冷。 But skates can glide on it very fast. 可冰刀在上面，能滑得飞快。 The skate pushes very hard on the ice. 冰刀压在冰面上，力气很大。 That pressure makes a thin layer of water. 压力让冰面融出薄薄一层水。 The water is like a smooth slide. 这层水呀，就像一条滑溜溜的滑道。 You really slide on water, not on ice. 其实你是在水上滑，不是在冰上。 That is why skating feels so light. 难怪滑冰时，脚底下那么轻快。