以下为句子列表：
英文: Unfortunately, in spite of more than 50 years' work and billions of dollars of backing, no one has yet managed to get an Earth-bound fusion reaction to produce useful energy.
中文: 遗憾的是，尽管进行了50多年研究，耗费了几十亿美元，至今无人可以在地球上实现聚变反应，制造可以使用的能量。
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