随着样板房屋总面积的增加，每个区域的流速平衡的必要性就更加突出。
As the gross floor area of the sample houses increases, the necessity of flow rate balancing for each zone becomes more crucial.
约十亿平方米(相当于1400万套70平方米的房屋)仍然完好的住宅被推倒，全国范围内这种房屋总面积还剩下9亿平方米。
About 1 billion square meters worth of public housing (or about 14 million, 70-square-meter units) have been torn down.
约十亿平方米(相当于1400万套70平方米的房屋)仍然完好的住宅被推倒，全国范围内这种房屋总面积还剩下9亿平方米。
About 1 billion square meters worth of public housing (or about 14 million, 70-square-meter units) have been torn down.
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