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.

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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).

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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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