1. separation of uranium isotopes 
   铀同位素分离
2. a radioactive transuranic element that is similar to uranium; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239. 
   一种放射性超铀元素，类似铀，少量存在于铀矿中，通常在核反应堆中合成，已知有种同位素，最重要的是钚。
3. extraction and purification of uranium 
   铀的提取和纯化
4. seed cleaning and separating machine 
   种子清选机械
5. Isotopes also prove helpful in other conditions. 
   事实证明，在其他情况下，同位素也很有用处。

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