The crookedness of the stairway make it hard for the child to get up.
弯曲的楼梯使小孩上楼困难.
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Crookedness will occur when one side is stiffer, not if both sides are equal.
当一侧相对僵硬时,扭曲就会出现, 两侧不能对称.
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"they built a tree house in the tortuosities of its boughs"
"the acrobat performed incredible contortions"