People often start counting "nine cold periods" starting from winter solstice.
人们通常从冬至开始计算“九个寒冷期”。
At the same time that the Northern Hemisphere is entering summer, the South Pole is tilted away from the sun, and the Southern Hemisphere is starting to feel the cold of winter.
与此同时，北半球进入夏季，南极倾斜远离太阳，南半球已开始感受到冬天的寒冷。
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