气体

例句：

1. 1. The gas leaked into the room and filled it with a thick fog.
   气体泄漏到房间里，充满了浓雾。
2. 2. Gases are made by combining different elements to form compounds.
   气体是通过将不同的元素结合形成化合物制造的。
3. 3. The scientist used a gas detector to detect the presence of dangerous chemicals.
   科学家使用气体探测器来检测有害化学品的存在。