... 木材的收缩量：lumber shrinkage 木材按质分类：grading timber 木柄番铲：Shovel w/wooden handle ...
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grading of timber [木] 等级材
CONiferous sawn timber-Grading 针叶树锯材分等
Grading of structural timber 支撑用建筑木材分类
grading g timber 木材按质分类
Timber strength grading 锯材强度分等
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