名词
中文翻译：Unknown
同义词：
['underpainting', 'underpainting', 'undercoat']
例句：
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1. The car was painted with a special undercoating to protect it from rust.
这辆车被涂了一种特殊的底漆来保护它免受锈蚀。
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2. Before painting the walls, they apply an undercoating to ensure a smooth finish.
在粉刷墙壁之前，他们先涂上一层底漆以确保平滑的外观。
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3. The artist applied several layers of undercoating before applying the final coat of paint.
这位艺术家在涂上最后一层油漆之前，先涂了好几层底漆。