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。
He would twine forming small circle of single one, and then put these small circle respectively in a long piece of bamboo pole, ready to the woods bird.
他将麻绳一根根结成单独的小圆圈，然后把这些小圆圈分别系在一根长竹竿上，准备也到树林中去捕鸟。
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