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1.Astronomers ascribed them to thermonuclear fusion of hydrogen or helium or to the sudden accretion of matter onto the star.
天文学家因此可将其归因于氢或氦的热核融合反应，或是有物质突然被星体吸附而产生的。收藏指正
2.When the hydrogen in the shell, too, is exhausted, the star takes to fusing helium there.
当壳层中的氢也燃烧殆尽，恒星便开始融合氦。收藏指正
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。收藏指正
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