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地球上天气的冷热,是取决于太阳对地球的辐射位置。入秋后,大阳光由直射地球逐渐转为斜射,地面所受的辐射强度下降,天气逐渐变凉。
The hot and cold weather on earth depends on the location of the sun’s radiation on the earth. After autumn, the sun shines from the direct earth to the oblique, the radiation intensity on the ground drops, and the weather gets cooler.