边材易于保存，但是硬材不易保存。
硬材树种除热带地区以外，均为落叶树。
Hardwood trees are deciduous trees, except in the warmest regions.
硬材有许多种，如乌木、各种桃花心木、枫树、柚木和美国黑胡桃木。
Included in the category are ebony, various mahoganies (see mahogany family), maple, teak, and American Black walnut.
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