heartwood
音標['hɑ:twud] 讀音漢語翻譯
n. 心材
英文解釋：
名詞 heartwood:
- the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood同義詞：duramen
詳細解釋：
heart.wood
n.（名詞）The older, inactive central wood of a tree or woody plant, usually darker and harder than the younger sapwood.Also called duramen 心材，樹幹：樹木或木本植物中較老的不再生長的部分，通常比樹齡短的邊材更硬且顏色更深也作 duramen
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