木材的中心轴向，反应干缩率的指向名词。 木材沿树干方向叫做纵向，沿年轮方向叫做弦向，沿树干半径方向或木射线方向叫做径向。
计算中采用传统的弦向级数和展向分条。
A spanwise strip together with a classical chordwise series are used.
导管是对酸雨敏感的一种组织，受害材导管的弦向直径小于健康材。
Vessel is known to be sensitive to acid rain, its tangential diameter of diseased poplar decreased than that of healthy poplar.
程序除能按常规提供横流截面展向压强分布外，还能提供弦向压强分布。
The code developed can provide not only the spanwise pressure distribution as usual on cross-flow planes, but also the chordwise pressure distributions.
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