It is the key for the reduction of construction initial energy use to reduce the embodied energy intensity and quantity in per usable floor area of the main materials.
降低主要建筑材料的内含能量强度值和单位建筑面积内建筑材料的使用量，是降低施工初始能耗的有效途径。
In 1959, various factors such as reduction of sown areas, less yield per unit area and natural disasters contributed to the decrease in grain output.
1959年开始，由于播种面积减少、单产下降、自然灾害等原因，粮食产量连年下滑。
In 1959, various factors such as reduction of sown areas, less yield per unit area and natural disasters contributed to the decrease in grain output.
1959年开始，由于播种面积减少、单产下降、自然灾害等原因，粮食产量连年下滑。
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