a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
helium的用法和样例:
例句
用作名词 (n.)
Helium and neon are inert gases. 氦和氖为惰性气体。
Most big balloons are now filled with helium. 现在许多大气球中充的是氦气。