以下为句子列表：
英文: A substance, such as water or graphite, that is used in a nuclear reactor to decrease the speed of fast neutrons and increase the likelihood of fission.
中文: 慢化剂一种物质，如水或石墨在核反应堆中用来减缓中子运动速度和提高裂变可能性的物质
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英文: Although almost all this material, which has a 24,000-year half-life, has since disappeared (primarily through natural radioactive decay), some of the plutonium itself underwent fission, as attested by the presence of its characteristic fission products.
中文: 这些物质半衰期为2万4000年，几乎已经全部消失（主要是经由自然的放射衰变过程），而且部份的钸本身又经过核分裂，这可由其核分裂产物为证。
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英文: As for economics, study after study rates nuclear fission one of the cheapest ways to make power.
中文: 就经济学方面来说，一再的研究认为核裂变是获取核电的最便宜方式之一。
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英文: But with the use of fusion instead of fission, that difficulty is resolved.
中文: 但是用核聚变方法代替核裂变方法之后，这一困难将得到解决。
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英文: Cadmium has the ability to absorb neutrons, so it is used as a barrier to control nuclear fission.
中文: 镉有吸收中子的能力，所以它被用作防止核裂变的屏障。
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