此外木材等级分类系统是在2006年，两国就软木材发生争议时，经过双方的同意而建立的。
Furthermore, the system for grading timber was agreed on by the two countries in 2006, when they settled their previous spat over softwood lumber.
通常这种等级的木材是从短原木和短而粗的圆木块上锯下的，以保证其具有完美的径切四分瓣。
Often this grade of wood is hand-split from bolts or blocks that are taken from rounds straight from the tree to ensure perfect quarter orientation.
木材分开后，分级工再次标记等级。
Again, after the lumber has been separated, the grader assigns a grade.
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