copal painting medium

例句：

1. 1.The artist used copal as a medium to create the vibrant colors in his artwork.
   艺术家使用copal作为媒介来创作他艺术作品中的鲜艳色彩。
2. 2. The painter found that using copal as a medium improved the quality of their oil paintings.
   画家发现使用copal作为媒介提高了他们油画的质量。
3. 3. The sculptor experimented with different materials and found that copal was the best medium for creating detailed sculptures.
   雕塑家尝试了不同的材料，并发现copal是制作详细雕塑的最佳媒介。