problemc问题problemn.问题；难题；习题adj.成问题的；难对付的problem population问题人口Problem in quality质量问题problem definition题目说明,题目限定,问题定义problem blackboard[计] 问题黑板problem and plight问题与困境Problem Clarifying问题problem throughput问题吞吐量problem and stress问题与压力problem bank loans银行“问题贷款”problem of farmers农民问题