以下为句子列表：
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: Application effects on the dam of Dachaoshan Hydropower Plant show that the polypropylene fiber shotcrete has high anti-fission performance and durability.
中文: 在大朝山水电站大坝实际应用的效果表明，聚丙烯纤维喷射混凝土具有良好的防裂性和耐久性能。
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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: Cowan described, for example, how some of the neutrons released during the fission of uranium 235 were captured by the more abundant uranium 238, which became uranium 239 and, after emitting two electrons, turned into plutonium 239.
中文: 例如，柯文描述了某些铀235分裂所释放的中子，如何被含量更多的铀238捕捉而产生铀239，在放射出两个电子后又变成钸239。
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英文: For in ordinary uranium there is much more of the U238 isotope than there is U235 and, as you know, U238 will not undergo fission easily.
中文: 因为在普通铀中，铀238同位素要比铀235多得多，而且正如你所知，铀238不易裂变。
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