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Common Grade of Lumber - Grades at least 66.66% clear in cuttings 3" wide by 3' long or 4" wide by 4' long minimum.
符合美国硬木协会要求的板材等级：普通1级，至少66。66%表面干净，3英寸宽以上，3英尺长以上；或4英寸宽以上，4英尺长以上。
Although considerable research has been completed on utilization of low-grade hardwood lumber, such research needs to continue.
尽管对低级别硬木应用的研究已经完成了不少，但这样的研究还得继续。
So the properties of plastic molding for lower strength grade lumber can be improved by reducing the strain rate.
硬化强度等级低的板材可以通过降低变形速率改善塑性成型性能。
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