gaseous toxicant

例句：

1. 1. The atmosphere is filled with gaseous molecules.
   大气中充满了气体分子。
2. 2. Gases are composed of atoms that have a certain number of electrons.
   气体是由具有特定数量电子的原子组成的。
3. 3. The scientist conducted experiments to study the properties of gaseous matter.
   科学家进行了实验，研究了气体物质的性质。