求翻译：近几年来，我国的保障性住房制度在解决城市低收入家庭住房困难中发挥了积极的作用，但城市保障性住房制度相对滞后，政策配套措施还不完善，保障性住房建设亟需加强。主要存在的问题有廉租房建设进展缓慢，效果不足；经济适用房未能真正满足城市中低收入家庭的住房需要等。为了切实解决中低收入家庭的住房困难，应加强对保障性住房制度的完善，加大保障性住房的供应量。是什么意思？

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