gaseous contaminant

例句：

1. 1. The atmosphere is filled with gaseous particles.
   大气中充满了气体颗粒。
2. 2.Gases are made by combining hydrogen and oxygen.
   气体是通过将氢气和氧气混合制成的。
3. 3. The scientist discovered a gaseous substance that could be used for energy.
   科学家发现了一种可用于能源的气体物质。