名词
中文翻译：木材等级
同义词：
['lumber grade', 'lumber quality']
例句：
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1.The timber grade of the logs is determined by their thickness and density.
这些木材的等级由它们的厚度和密度决定。
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2.Timber grades are used to classify different types of wood for sale.
木材等级用于将不同类型的木材分类销售。
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3. The company's timber grades are highly regarded in the industry.
该公司的木材等级在行业内享有很高的声誉。