4) 极轴（polar axis）: 指通过髋臼部分内球面中心并垂直于髋臼凸缘平面的轴；如果髋臼没有凸缘，则是指 通过款就部件内球面中心并垂直于髋臼基；底平面...
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不同居群栝楼花粉形态的扫描电镜观察-中国教育论文联盟 关键词】 栝楼；花粉；赤轴；极轴 [gap=581]Key words：Trichosanthes kirilowii Maxim.; Pollen morphology; Polar axis; Equatorial axis
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polar axis shaft 极坐标轴
mean polar axis 平极轴
polar axis tracking system 极轴跟踪系统
heliostat with polar axis 极轴式定日镜
telescope polar axis 望远镜极轴
polar axis rolling method 极轴翻滚试验
polar symmetry axis 极性对轴 ; 极性对称轴
N the fixed line in a system of polar coordinates from which the polar angle, θ, is measured anticlockwise 极轴
The alignment of the polar axis and the monitoring of the guiding process require absolute accuracy.
极轴的摆放及追踪过程必须十分准确。
Earth is shifting its polar axis and reversing its polar charges to operate more in alignment with the new level of energy vibration.
地球正在进行极轴转移，正在进行磁极翻转，以与新的能量振动程度更好的校准。
Because of its oblate shape, the moment of inertia of the earth is a maximum about the polar axis and minimum about an axis in the equatorial plane.
由于地球是扁球体，绕极轴惯量矩最大，而绕在赤道面内的轴的惯量矩最。
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