reagent gas

例句：

1. 1. The chemical analysis required the use of a reagent gas for the reaction.
   化学分析需要使用一种试剂气体进行反应。
2. 2.The laboratory technician carefully prepared the reagent gas before starting the experiment.
   实验室技术员在开始实验前小心地准备试剂气体。
3. 3. The scientist used a reagent gas to detect the presence of a particular element in the sample.
   科学家使用一种试剂气体来检测样本中特定元素的出现。