劍橋詞典a first layer of paint that is put on a surface in order to improve the appearance of the final one, or the paint used for this 內(nèi)涂層，底涂層；底漆，底層涂料 Those red walls will probably need two undercoats. 那些紅色墻壁可能需要刷兩層底漆。 比較topcoat 返回 undercoat