underpainting
1. He reveals every step of his process,from underpainting to the finished rendering.
他展示他处理过程的每一步骤,从上底色到最终渲染完成。
2. She experimented with different kinds of underpainting, scraped and rubbed, made bright rosy red spots;
她尝试着使用了不同的画底色,刮了,擦了,画出了明亮的玫瑰红点;