一个世纪前，亨利·卡文迪什注意到当空气中的氧气和氮气被除去，还有其他剩余气体存在，但人们还没有认识到它们的重要性。
A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen and nitrogen are removed from air, but its importance had not been realized.
维斯必须蒸馏、加热并使空气样品通过吸附剂，以除去二氧化碳和氪等会污染极灵敏的探测器的气体。
Weiss had to distill, heat and pass the air samples over adsorbents to remove gases such as carbon dioxide and krypton that could foul the extremely sensitive detector.
云仍然是全球气温变化预报中最主要的不确定因素(除去人类是否有决心控制温室气体排放这一因素之外)。
Clouds remain the biggest source of uncertainty (apart from human decisions to control greenhouse gas emissions) in predicting how much global temperatures will change.
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