vertical comparator

例句：

1. 1. The vertical comparator is used to compare the height of objects in a vertical plane.
   垂直比较器用于比较物体在垂直平面上的高度。
2. 2. The vertical comparator was invented by a scientist who wanted to improve the accuracy of measurements.
   垂直比较器是由一位科学家发明的，他想要提高测量的准确性。
3. 3. The vertical comparator can be used to compare the lengths of parallel lines in a horizontal plane.
   垂直比较器可以用来比较水平面上平行线的长度。