parallel of latitude 纬度圈 ; 黄纬平行圈 ; 等纬圈 ; [天] 黄纬圈
If there is a line passing the top of the ruler, and parallel to the equator, then the Angle between the line and the ruler is equal to the latitude here.
如果有一条线和赤道线平行，而且经过尺的顶端，这条线和尺的夹角就等于纬度。
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Beijing is close to the fortieth parallel of north latitude.
靠近北纬度或南纬度的无风的地带或区域。
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