How to: Sit on a stability ball with feet hip-width apart on the floor.
如何锻炼：稳坐在一个球上，双照着地，与胯同款。
2
Irrelvant to dam stability, crest width is determined as required by structure, traffic, construction, and operation.
坝顶宽度与坝的稳定没有直接的关系，主要取决于构造、交通、施工及运行等要求。
3
The stability of the reconstruction procedure is discussed using the condition number of matrix, and the theoretical maxima of the refraction angle and USAXS distribution width are given.