rare gas

例句：

1. 1.The rare gases are essential for many scientific experiments.
   稀有气体对于许多科学实验至关重要。
2. 2.The air is mostly composed of trace gases, such as nitrogen and oxygen.
   空气主要由痕量气体组成，如氮气和氧气。
3. 3. The noble gases are known for their unique properties, including their ability to conduct electricity.
   稀有气体因其独特的性质而闻名，例如导电能力。