随着时间的增加，气体利用率下降，表明还原前期反应速度快，后期反应慢；
The utilization degree of gas decreases with reaction, which shows that the reaction is rapid during the beginning of deoxidation process, while slower with time.
19世纪中后期的现实主义和自然主义画家都非常关注摄影——把它当作一种可以使用、可以向其学习和作出反应的东西。
The realistic and naturalistic painters of the mid- and late-nineteenth century were all intently aware of photography—as a thing to use, to learn from, and react to.
只有在全球气温变化开始和海平面反应之间的短暂滞后期间，适应气候变化的物种才能从赤道向高纬度地区迁移。
Only during the short lag between onset of global temperature change and sea level response can warm-adapted species migrate from the equator toward higher latitudes.
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