Because strength is critical in the construction of the soundboard, quarter-sawn(also known as edge-grain)lumber is essential.
在共鸣板的制作中，强度是非常关键的，四开（也叫做“径切面”）木材非常重要。
2
It was at the season when the grain is tall; on the edge of the plateau a battalion of Kempt's brigade, the 95th, armed with carabines, was concealed in the tall wheat.
当时正是麦子长得很高的季节，在那高地的边沿上，兰伯特旅部的第九十五营兵士都拿着火枪，伏在麦田里。
3
So the edge extracting must be done for grain measurement.