How to face the non-standardized labor-management relations,this is a important problem,also a difficult problem.
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Parallel program is an active research field presently, and it is also a difficult problem.
并行程序目前是一个活跃的研究领域，也是一个困难问题。
New village development is not only a big issue but also a difficult problem in China at present.
新农村建设是我国新时期建设的一项大事，同时也是一道难题。
Sample complementing is the practical demand of sampling survey, and its also a difficult problem in sampling technology.
样本追加是抽样调查的现实需求，也是一个抽样技术难题。
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