径切面（radial section），是指通过髓心，与木射线平行或与年轮垂直的树干纵切面。
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。
Because strength is critical in the construction of the soundboard, quarter-sawn(also known as edge-grain)lumber is essential.
该地板包括表板、基材，基材的表面为木材横切面、径切面或者木材径切面和横切面的交错面。
This floor comprises a face board and a base material, the surface of base material is timber cross section, radial section or staggered section of timber cross section and radial section.
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