There are two key problems with Hansen's argument against coal: cost and scale.
汉森反对使用煤炭的论点存在以下两个关键问题：这么做的花费和改变的规模。
Low Organic matter removal rate and membrane fouling are two key problems.
超滤技术的两个最主要障碍为对有机物去除效果差和膜污染问题。
In my experience, two key problems plague documentation in software development.
按照我的经验，有两个关键性的问题制约着软件开发的文档化。
It is two most key problems of modern network education to be standardized and intelligent.
标准化和智能化是现代网络教育的两个最关键的问题。
It is two most key problems of modern network education to be standardized and intelligent.
标准化和智能化是现代网络教育的两个最关键的问题。
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