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.
随便看	imperatrice imperatrix imperceptibility imperceptible imperceptibly imperceptive impercipience impercipient imperfect imperfect competition imperfection imperfective imperfectly imperfect rhyme imperforate imperial imperial beard imperial blue imperial city imperial cloth imperial defence imperial defense imperial dome imperial drink imperial eagle

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