heartwood
美['hɑːrtwʊd] 英['hɑːtwʊd]
n. 赤木质；心材
英英释义
Noun- the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood
例句
用作名词(n.)- The narrow band of sapwood is very similar in colour to the heartwood.边材的窄带颜色与心材非常相似。
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