examination of colostrum stain

例句：

1. 1. The teacher conducteda thorough examination of the students' work.
   老师对学生的工作进行了彻底的审查。
2. 2. The company isconducting an internal examination to identify anypotential issues.
   公司正在进行内部审查，以找出任何潜在问题。
3. 3. The scientist conducted an extensiveexamination of the samples collected from the site.
   科学家对从现场收集的样本进行了广泛的检查。