目前，我们关注的是临界量阈值需求方面的问题。
Currently, the focus has been on the demand aspects of the critical mass threshold problem.
在环境方面人们关注的一个主要问题是地表和地下水中含氮量的增加。
A major environmental concern is increase of nitrogen in both surface and subsurface waters.
在环境方面人们关注的一个主要问题是地表和地下水中含氮量的增加。
A major environmental concern is increase of nitrogen in both surface and subsurface waters.
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