名词
中文翻译：基础涂层
同义词：
['undercoat', 'primer']
例句：
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1. The painter applied the base coat beforepainting the walls.
画家在刷墙之前先涂了一层底漆。
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2. Before applyingthe final coat of paint, it's important to apply a base coat first.
在最后涂油漆之前，首先需要涂一层底漆。
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3. The base coat is essentialfor the proper adhesion ofthe top coat.
底漆对于顶层涂料的附着至关重要。