molecular drag gauge

例句：

1. 1.The molecular drag gauge was used to measure the speed of the molecules in the gas.
   分子拖曳式测速仪被用来测量气体中分子的速度。
2. 2. The molecular drag gauge was used to study the behavior of molecules in different environments.
   分子拖曳式测速仪被用来研究不同环境中分子的行为。
3. 3.The molecular drag gauge was used to detect any changes in the speed of molecules in the gas.
   分子拖曳式测速仪被用来检测气体中分子速度的任何变化。