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1. Oxford Dictionary

   heartwood

   • IPA[ˈhɑːtwʊd]

   英式

   • n.
     the dense inner part of a tree trunk, yielding the hardest timber.

   • noun: heartwood

2. • 更多解釋

   heartwood

   • IPA[ˈhärtˌwo͝od]

   美式

   • n.
     the dense inner part of a tree trunk, yielding the hardest timber.

   Oxford American Dictionary