First, I folded two rectangular pieces of construction paper in half.
首先把两张长方形的硬纸折成两半。
To meet the demand of composite packing, the research development of rectangular pieces packing problems is reviewed.
从复合材料排样的需求出发，研究了矩形件排样问题。
To meet the demand of composite packing, the research development of rectangular pieces packing problems is reviewed.
从复合材料排样的需求出发，研究了矩形件排样问题。
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