And in the case of bevel gears, the rotational axes are not parallel to each other.
在斜齿轮情况下，并且，旋转的轴不是互相平行的。
Both planets have roughly the same amount of land surface area, sustained polar caps, and both have a similar tilt in their rotational axes, affording each of them strong seasonal variability.
这两个行星都有大致相同的地表面积，都有极冠，都有类似的倾斜旋转轴，使得火星和地球都有很强的季节性变化。
And fivefold, threefold and twofold axes of rotational symmetry.
五重，三重和两重螺旋对称轴。
And fivefold, threefold and twofold axes of rotational symmetry.
五重，三重和两重螺旋对称轴。
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