-
1. Thebubble protractor is used to measurethe depth of a liquid.
气泡延长器用于测量液体的深度。
-
2. The bubbleprotractor was inventedby a scientist who wanted toimprove the accuracy of his measurements.
气泡延长器是由一位科学家发明的，他想要提高他的测量的准确性。
-
3. The bubble protractor is a useful tool for scientistswho study the behavior of gases influids.
气泡延长器是科学家们研究气体在流体中行为时的一个有用的工具。