Our principal problem is lack of time.
我们的主要问题就是缺少时间。
Resolving equation group is a principal problem in engineering study.
解方程组是工程研究中的基本问题。
The effect of constituent variations is the principal problem for nuclear analysis.
成分的影响是核分析的主要问题。
The effect of constituent variations is the principal problem for nuclear analysis.
成分的影响是核分析的主要问题。
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