The crookedness of the stairway make it hard for the child to get up.
彎曲的樓梯使小孩上樓困難.
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Crookedness will occur when one side is stiffer, not if both sides are equal.
當(dāng)一側(cè)相對僵硬時,扭曲就會出現(xiàn), 兩側(cè)不能對稱.
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"they built a tree house in the tortuosities of its boughs"
"the acrobat performed incredible contortions"