在强支撑交错桁架结构中，柱子受到的转动约束不仅来源于桁架构件，而且还来源于上、下柱。
In the strong-bracing staggered truss structure, the rotating restraints which the columns suffer come from not only the members of the truss, but also the columns up and down.
在这种情况下，我假设该圆柱是以柱轴跟地面平行的方式下落的(这样才能使人背部着地)。
In this case I will assume the cylinder is falling with the axis of the cylinder parallel to the ground (so the person would land on the back).
球状关节是的人类上肢骨骼可以在肩部自由旋转，这也是汽车车轮在转向柱的操控下转向的关键所在。
Ball and socket joints let your arm bones rotate at the shoulders and also allow the wheels of your car to be turned through the steering column.
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