Abbe comparator principle

例句：

1. 1.The scientist used a comparator to measure the accuracy of his measurements.
   科学家使用一个比较器来测量他的测量的准确性。
2. 2.The teacher used a comparator to compare the two books.
   老师使用一个比较器来比较这两本书。
3. 3. The student used a comparator to compare the prices of the two products.
   学生使用一个比较器来比较这两个产品的价钱。