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。

Common Grade of Lumber - Grades at least 66.66% clear in cuttings 3" wide by 3' long or 4" wide by 4' long minimum.

youdao

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。

Common Grade of Lumber - Grades at least 66.66% clear in cuttings 3" wide by 3' long or 4" wide by 4' long minimum.

youdao