可知晓气温变化的原因，仍然是一大科学难题。
But understanding how the planet's temperature changes is still a challenge to science.
由于严寒地区冬季气候寒冷、年内气温变化幅度大；
In harsh climate region, the air temperature changes greatly between winter and summer.
没有空气的话，地球上的气温变化将非常 大。
Without air, the earth would undergo extreme changes in temperature.
在大气温室效应加剧、气候变暖趋势明显的大背景下，地球气候变化的趋势和特征一直是人们普遍关心的热点话题。
Increase in atmospheric greenhouse effect, climate warming trend is clearly against the background of the Earth climate change trends and characteristics has been a hot topic of general interest.
在大气温室效应加剧、气候变暖趋势明显的大背景下，地球气候变化的趋势和特征一直是人们普遍关心的热点话题。
Increase in atmospheric greenhouse effect, climate warming trend is clearly against the background of the Earth climate change trends and characteristics has been a hot topic of general interest.
应用推荐