spot-analysis

例句：

1. 3.
   在摄影中
2. 1. The scientist performed a spot-analysis of the sample to determine its composition.
   科学家对样本进行了斑点分析，以确定其成分。
3. 2. During the inspection, the engineer noticed a small crack in the wall.
   在检查过程中，工程师注意到墙上有一道小裂缝。
4. 3. The teacher conducted an examination on the students' understanding of the material covered in class.
   老师对学生对课堂上覆盖的材料的理解进行了考试。