名词
中文翻译：背材
同义词：
['backing timber', 'backwoodstimber']
例句：
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1. The carpenter used back timber to build theshelves.
木匠用背材来建造书架。
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2.The old house had a lot of backtimber that needed to be replaced.
这所老房子有很多需要更换的背材。
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3.The builder used back timber to reinforce thewalls of the new building.
建筑商用背材加固了新建筑的墙壁。