Proponents of generating clean energy from nuclear fusion, the reaction that powers the Sun, have had to live for decades with the taunt that a commercial fusion plant always seems to lie 30 years in the future. But the chances that the timescale might become considerably shorter rose with the official announcement on Tuesday that, for the first time, the energy output from an experimental reactor had exceeded the input.
数十年来，支持通过核聚变（为太阳提供能量的反应）产生清洁能源的人不得不一直忍受嘲笑：商业核聚变发电厂距离实现似乎永远还差30年。但这个时间表有可能会大幅缩短，原因是美国一个国家实验室日前正式宣布，一个实验性核聚变反应堆的能量输出首次超过了能量输入。
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