名词
中文翻译：Unknown
同义词：
['hardwood', 'solid wood']
例句：
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1.The engineer used a laser to hardenthe layer of wood on the table.
工程师使用激光来硬化桌子上的木材层。
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2.The carpenter carefully carved out thehardened layer of wood for the door.
木匠小心翼翼地雕刻出门的硬木层。
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3. The old tree had a hardenedlayer of wood that was resistant to decay.
这棵老树有一个坚硬的层，可以抵抗腐烂。