他们总是与我们辩论如何处理大气污染问题。
They always argue against us on how to conduct the air pollution.
问题是，这些气体在大气中有很长时间的寿命。
The problem is that these gases have a long life time in the atmosphere.
当我们把大量额外的二氧化碳排入大气层的时候，问题就出现了。
The problem begins when we add huge quantities_of extra carbon dioxide into the atmosphere.
这其中大气污染是一个较为突出的问题。
行星大气中地形效应的研究一直是人们十分重视的问题。
It is always a significant object to study the orographic effect on the planetary atmosphere.
问题是什么样的措施该采取，以防止大气污染。
The question is what steps we should take to control air pollution.
本文讨论大气细颗粒物与人体健康问题。
This paper reviewed about the atmospheric fine particles and human health.
第一个领域是重返大气层问题，在50年代中期这成为一个前沿课题。
The first was the re-entry problem, which came to the forefront during the mid-1950s.
第一个领域是重返大气层问题，在50年代中期这成为一个前沿课题。
The first was the re-entry problem, which came to the forefront during the mid-1950s.
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