以下为句子列表：
英文: Finally, there should be no significant amounts of boron, lithium or other so-called poisons, which absorb neutrons and would thus bring any nuclear reaction to a swift halt.
中文: 最后一点，周围不能有大量的硼、锂或其他称为抑制剂的物质；这些物质会吸收中子，使核反应中止。
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英文: The application fields of these kinds of nuclear reaction are indicated.
中文: 指出了这几种核反应的使用领域。
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英文: The bombs, however, are fairly crude—in the underground test, the nuclear reaction was probably triggered by a large conventional charge.
中文: 然而，这些核弹相当原始：在地下实验中，核反应也许由一个硕大的传统引爆装置激发。
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英文: The point at which a nuclear reaction is self-sustaining.
中文: 临界点核反应能够自我维持的一个点
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英文: This observational result provides a strong constraint on the theoretical models of nuclear reaction processes that produce heavy elements in the universe.
中文: 这一观测结果提供了强有力的制约,理论模型的核反应过程产生的重元素宇宙.
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