Want no shape, the joining together of rotation Angle is the first selected object must be horizontal, so shape combination when we first select leaves and selected other shapes.
想得到无旋转角度的拼接形状，则第一个选中的对象必需是水平的，因此形状组合时我们才要先选中叶子再选中其它形状。
It is shown that, when the effect of warping on rotation Angle is neglected, tension (or compression) is only coupled with horizontal bending and vertical bending instead of constrained torsion.
所得到的刚度矩阵表明，只有当忽略翘曲变形对截面转角的影响时，轴向拉压才只与水平弯曲及竖向弯曲相耦合，而与约束扭转不再耦合。
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