晚材（wancai）亦称秋材，得名来自其生长时期。
n. summerwood
misc. late wood
木材密度与晚材率的正相关显著。
造林密度大，则生长轮变窄，管胞列数减少，晚材率增加。
As planting density increased, the growth ring width and tracheid row decreased but proportion of late wood increased.
木头的变化速度虽然不快，但是各部分的变化步调是不一致的——木头其实是一个包含各种元素的混合体：既有早材，又有晚材；既有直纹，又有波纹；还有木节、年轮和疵点。
Wood moved slowly, but not equally, with its mixture of springwood and summerwood, straight and wavy grain, knots, rings and imperfections.
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