gaseous fission product

例句：

1. 1.The atmosphere is mostly composed of gaseous elements.
   大气主要由气体元素组成。
2. 2. Gases are made up of molecules that can be compressed and heated.
   气体是由可以压缩和加热的分子组成的。
3. 3. The gaseous composition of the atmosphere varies with altitude.
   大气的气体成分随着海拔高度的变化而变化。