一个物体的各部分都要受到重力的作用,从效果上看,可认为各部分受到的重力集中于一点,这一点叫做物体的重心.重心的位置与物体的形状、质量的分布有关.生活中的许多现象与物体重心的位置及其变化有关,留意观察一下,常常会觉得很有趣. Each part of an object is subject to gravity. From the effect point of view, the gravity of each part is considered to be concentrated at one point. This is called the center of gravity of the object. The position of the center of gravity is related to the distribution of the shape and quality of the object. Many of the phenomena are related to the location of the body’s center of gravity and its changes. It is often interesting to watch it.