US government scientists have achieved net energy gain in a fusion reaction for the second time, a result likely to fuel optimism that progress is being made towards the dream of limitless, zero-carbon power.
美国政府科学家第二次在核聚变反应中实现了净能量增益，这一结果可能会让人们更加乐观，认为人们正在朝着无限、零碳发电的梦想迈进。
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