名词
中文翻译：背泥
同义词：
['backing', 'backing material', 'backing compound']
例句：
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1. The car was stuck in the mud, and we needed some back putty to lift it out.
汽车陷在泥里了，我们需要一些背泥来把它推出来。
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2. The engineer used a special back putty to fill the cracks in the wall.
工程师用一种特殊的背泥来填充墙上的裂缝。
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3. The painter used back putty to smooth the surface of the canvas before painting.
画家在使用油漆之前，先用背泥平滑画布的表面。