1. atomic spectrum of helium 
   氦原子光谱
2. waves in liquid helium 
   液氦中的波
3. The Hydrogen gas is usually the first type of gas consumed in a star and then other gas elements such as Carbon, Oxygen, and Helium are consumed. 
   最早被燃烧的恒星气体通常是氢气，随即开始消耗其它气体元素，如碳、氧和氦。
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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• 1. 氦星
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