At temperatures around minus 230 degrees Fahrenheit, dust blowing up from below or falling into the atmosphere from space provides a resting spot for water vapor to condense and freeze.
在大约零下230华氏度的气温下,由下而上吹起或从太空落下的灰尘为水汽提供了凝缩冻结的停留地点。
It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量(降雨量与径流深之差)持平。
It is an ice wonderland, full of people braving the cold, diving into frozen water and enjoying themselves at minus 30 degrees.
这是一个冰雪幻境。人们无惧寒冷,英勇跳入冰水当中,享受着零下三十度的欢乐。
And if I do that then I can find out the change in enthalpy of this reaction. It's just going to be the heat of formation of these three moles of water, minus the heat of formation of the iron oxide. OK.
我就能得到这个,反应的焓的变化,它就是三摩尔水,的生成热,减去氧化铁的,生成热,好。
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