Bend the right knee and place the sole into the inside of the supportingleg.
屈右膝，脚掌抵在支撑腿内侧。
2
Because of the special structure of hip point, the hip can make 3-axis movement around supportingleg.
由于骸关节的特殊生理结构决定其可以绕支撑腿一侧支点做三轴运动。
3
For supportingleg with varying cross section, it is necessary to calculate equivalent inertia moment prior to calculating internal force of plane frames.