metallographic etching

例句：

1. 1. The process of metallographic etching is crucial for the study of materials science.
   金属学蚀刻过程对于材料科学的研究至关重要。
2. 2. During the metallographic etching process, the sample is exposed to a chemical solution that removes the surface layer.
   在金属学蚀刻过程中，样品暴露于一种化学溶液中，以去除表面层。
3. 3. The metallographic etching technique has been used to reveal the internal structure of complex materials.
   金属学蚀刻技术已被用于揭示复杂材料的内部结构。