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历史上我国气候的演变大致呈现冷暖交替的状态,总的趋势是由暖变寒,则温暖期时间趋短,程度趋弱,而寒冷期时间趋长,
In history, the evolution of China’s climate has generally shown an alternating cold and warm state. The general trend is from warming to cold, and the warm period tends to become shorter and weaker, while the cold period tends to be longer.