生活水平逐步提高。
人们生活水平逐步提高，对居住环境提出了更高的要求。
And request of inhabitancy condition get more and more higher.
随着人们物质生活水平逐步提高，人类越来越关注自身赖以生存的空间质量。
As the improving of material living standards, human beings pay more attention to its own quality of survival space.
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