phase contrast microscope

例句：

1. 1. The phase contrastmicroscope is used to analyze the crystal structureof materials.
   相衬显微镜用于分析材料的结构。
2. 2.The phase contrast microscope was used to studythe surface morphology of the sample.
   相衬显微镜被用来研究样品的表面形态。
3. 3. The phasecontrast microscope was used to detect the presenceof impurities in the sample.
   相衬显微镜被用来检测样品中杂质的存在。