So now, this parallel as a circle of radius, well, the radius is less than a because if your vertical is to the North Pole, it will be actually much smaller.
这个平行线是一个有半径的圆，这个半径是小于a的，因为如果这个环越靠近北极点，它的半径实际上会越来越小。
A periodic change in the distribution of pressure between the North Pole and a circle at about 55degree.
在北极点与大约55度N纬圈之间气压分布的周期性变化。
The outer circle of the vertical pole is provided with a guiding elongated slot, and the slot base of the guiding elongated slot is processed with two small grooves which are respectively arranged.
立柱的外圆上设有一导 向长槽，在导向长槽的槽底加工有二个分别设置的小凹槽。
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