n. chord
受力弦材 stress chord
弦材应力 chord stress
木材气体弦向渗透性 tangential gas permeability of wood
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.
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