heart·wood /-ˌwʊd/
赤木質,心材
Heart·wood n. The hard, central part of the trunk of a tree, consisting of the old and matured wood, and usually differing in color from the outer layers. It is technically known as duramen, and distinguished from the softer sapwood or alburnum.
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heartwood
n : the older inactive central wood of a tree or woody plant;
usually darker and denser than the surrounding sapwood
[syn: duramen]