Schreger line

例句：

1. 1. The Schreger line is a tool used to measure the thickness of materials.
   施莱格线是一种用于测量材料厚度的工具。
2. 2. The Schreger line is often used in metallurgy to analyze the structure of materials.
   施莱格线在冶金学中常用来分析材料的组织结构。
3. 3. The Schreger line can be used to detect defects in castings and welding joints.
   施莱格线可以用来检测铸件和焊接接头中的缺陷。