惰性气体, 稀有气体
any of the unreactive gaseous elements helium, neon, argon, krypton, xenon, and radon
:
• Helium is a noble gas often used to inflate balloons.
氦气是一种常用于给气球充气的惰性气体。
• Argon is the most abundant noble gas in Earth's atmosphere.
氩是地球大气中最丰富的惰性气体。
