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23 天
新发现:木材除了软和硬,还有第三类
人们会根据树木产生的木材种类将它们分成两种类型。软木通常指针叶树材,比如松树和冷杉,它们通常比橡树和槭树这样的硬木(阔叶树材)生长得更快。硬木往往需要几十年才能成熟,形成更加致密的木材。然而,一项新研究有了一些特别的发现。他们提出了第三类木材,被称为 ...
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