track etching

例句：

1. 1.The artist used a brush to trace the outline of the landscape.
   艺术家用画笔勾勒出风景的轮廓。
2. 2.The engraving on the coin is very detailed.
   硬币上的浮雕非常精细。
3. 3. The scientist used an etching machine to create this intricate design.
   科学家使用蚀刻机制作了这个复杂的设计。