而如南北极，一年只有黑白两天，如赤道线，一年只有雨旱两季，时光一被拉长，疲劳和无望便成了主题。

And as the polar, a year only black and white and two days, such as the equator line, a year only the rain season two, a dry time be spun, fatigue and hopelessness became theme.

youdao

如果你以北极点为中心开始画圆，那么半径和半个子午线相等的圆周就是赤道，它包含的区域就是北半球。

If you start from that North Pole as centre, then the circle with radius equal to a half meridian is the equator, and the area included is the northern hemisphere.

youdao