Chemigum

例句：

1. 1.The chemical gases in the laboratory are dangerous.
   实验室里的化学气体是危险的。
2. 2. The chemical engineers were analyzing the chemical gases.
   化学工程师们正在分析化学气体。
3. 3. The chemical gases emitted by the volcano were toxic.
   火山排放的化学气体是有毒的。