The peasant worker's children education is a problem that must be solved.
农民工子女的教育是一个必须要解决的问题。
Nonuniformity of infrared focal plane arrays is a key problem that must be solved in its applications.
红外焦平面阵列的非均匀性是其应用中必须解决的技术难题之一。
How to evaluate course important level is a difficult problem that must be solved for designing courses scientifically.
如何评价课程重要程度，是科学规划课程必须解决的难题。
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