heartwood
noun /ˈhɑːtwʊd/
/ˈhɑːrtwʊd/
[uncountable]- the hard older inner layers of the wood of a tree
（树木的）心材
| 词汇 | heartwood |
| 释义 | heartwoodnoun /ˈhɑːtwʊd/ /ˈhɑːrtwʊd/ [uncountable]
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