comparator check

例句：

1. 1. The scientist compared the results of twoexperiments.
   科学家比较了两个实验的结果。
2. 2. Theteacher used a comparator to helpstudents understand the concept.
   老师使用了一个比较器来帮助学生理解这个概念。
3. 3. Comparators are used to compare and contrast differentitems.
   比较器用于比较和对比不同的项目。