In many cases, the bearing life centerofweight is not expressed in words.
在很多的时候，人生中心里所承受之重都是无法用言语来表达的。
2
The amount of angular momentum, say, a spinning skater has depends on both the speed of rotation, and the weight and distribution of mass around the center.
角动量的大小，取决于旋转中的滑冰选手的旋转速度、体重和绕旋转中心的质量分布。
3
Align the wrists perpendicular to the floor and center your weight on the edge of the forearm bone, rolling neither in nor out.