以下为句子列表：
英文: 5 a star begins to form when nuclear fusion takes place.
中文: 核聚变（核子融合）发生时，一颗恒星就开始了形成过程。
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英文: Astronomers ascribed them to thermonuclear fusion of hydrogen or helium or to the sudden accretion of matter onto the star.
中文: 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。
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英文: B.The surge of nuclear fusion would expand the gas in the core, cooling the core back down and quickly returning the nuclear fusion rate to normal.
中文: 太阳会变成一个更大、更热、更明亮的主序星并且会保持这种状态直到核心的氢燃料用尽为止。
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英文: Conventional physics holds that nuclear fusion ignites at multimillion-degree temperatures.
中文: 传统物理学认为，要引发核融合反应，必须将温度提高到数百万度。
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英文: D.Because the surge of nuclear fusion would expand the Sun's core, the outer layers surrounding the core would be compressed, igniting nuclear fusion in the outer layers and destroying our star in a comprehensive thermonuclear explosion.
中文: 太阳会变成一个更大、更热、更明亮的主序星并且会保持这种状态直到核心的氢燃料用尽为止。
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