gas gravimeter

例句：

1. 1. The gasgravimeter was used to measure the concentrationof carbon dioxide in the air.
   气体质量计被用来测量空气中二氧化碳的浓度。
2. 2.The gas gravimeter was used todetect the presence of harmful gases inthe workplace.
   气体质量计被用来检测工作场所有害气体的存在。
3. 3. The gasgravimeter was usedto monitor the levels of variousgases in the environment.
   气体质量计被用来监测环境中各种气体的水平。