1. atomic spectrum of helium 
   氦原子光谱
2. waves in liquid helium 
   液氦中的波
3. A synthetic element produced in trace quantities by helium isotope bombardment of curium. All isotopes are radioactive, chiefly by emission of alpha particles. Atomic number98; mass numbers244 to254; half-lives varying from25 minutes to800 years. 
   锎一种合成元素，由氦同位素轰击锔可得到微量的这种元素。所有同位素均是放射性元素，主要放射出α粒子。原子序数98；原子量244到254；半衰期从25分钟到800年不等
4. Helium is a monatomic gas. 
   氦是单原子气体
5. The antimatter equivalent of helium. 
   反氦与氦等价的反物质

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