名词
中文翻译：次级木材
同义词：
['second-class timber', 'inferior timber']
例句：
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1. The construction of the new bridgerequired the use of secondary timbers forits supports.
建造新桥需要使用次级木材作为其支撑。
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2. Thecompany decided to switch tosecondary timbers instead of usingmore expensive hardwoods.
该公司决定改用次级木材而不是更昂贵的硬木。
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3. The engineer carefully selected the best qualitysecondary timbers for the project.
工程师仔细挑选了最好的次级木材用于该项目。