molecular gauge

例句：

1. 1.The molecular gauge is used to measure the concentration of gases in a sample.
   分子秤用于测量样本中气体的浓度。
2. 2.The molecular gauge was used to detect the presence of impurities in the chemical compound.
   分子秤被用来检测化学化合物中的杂质。
3. 3.The molecular gauge was used to measure the temperature of the liquid.
   分子秤被用来测量液体的温度。