Our principal problem is lack of time.
我们的主要问题就是缺少时间。
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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。
In fact, the principal problem facing the two major parties in the congressional elections of 1998 was voter apathy.
CNN: By Ronald D. Elving, CQ Staff Writer
Early leaders recognized that the principal problem facing African-Americans was lack of access.
CNN: Lesson plan: Today's young leaders
Our undefined, unstable dollar caused the crash of late 2008, and it is the principal problem behind what is unfolding as the slowest economic recovery on record.
FORBES: What Is Gold Really Worth?
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