求翻译：　　会议指出，截止6月底，全国保障性住房新开工超过500万套，超过全年目标任务的50%。在建保障性住房预计年内建成400万套以上。当前存在的主要问题是：部分城市房价上涨压力仍然较大，有的城市调控力度有所放松。保障性安居工程建设进展不平衡，有的地方开工率较低，社会资金投入保障性住房建设的措施不完善，工程质量、分配管理等方面还有待加强。是什么意思？

　　Conference pointed out that by the end of June, national security housing started over 5 million units, exceeding the annual target task 50%. Security housing under construction is expected to completed and over 4 million units during the year. Main problems existing in current is: the larger the rising pressure in some cities, some cities have relaxed regulation. Supportability housing project construction progress uneven, some places low operating rate, measures of social capital investment guarantee housing construction is not perfect, project quality, distribution management, and more remains to be strengthened.