line coloring

• 线着色

line coloring的用法和样例：

例句

1. A new coloring technology for brass slide chain was intuduced.
   介绍了一种黄铜拉链着色新工艺。
2. The brown pigments are major part of coloring materials for food.
   棕色色素是食品着色物的重要部分之一。