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地球上有四季变化,在夏天会让我们感到非常炎热,在冬天又让我们感到异常寒冷。很难想象,假如地球上只有一个季节或各纬度地区温度常年没有大的差别,那么,对于人类和其他生命会有什么样的影响呢?
There are changes in the seasons on Earth, which make us feel very hot in the summer and make us feel cold in the winter. It is hard to imagine what would happen to humans and other lives if there were no major differences in the temperature of the Earth for just one season or latitude.