单词	heartwood
释义	heartwood /ˈhɑːtwʊd / noun [mass noun] The dense inner part of a tree trunk, yielding the hardest timber.In the inner heartwood, these bodies were rarefying and cell walls became impregnated by a brown colour.... Decayed heartwood may sufficiently weaken trees enough to increase ice and wind mortality. Only light wood was included in these samples; the chemistry of dark heartwood or disease-stained wood is known to be quite different from light wood.
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