Another important kind of interferences in reactor NAA is due to threshold reaction induced by reactor fast neutrons.
堆中子活化分析中的另一重要干扰是堆快中子引起的阈反应干扰。
But if an account reaches a certain threshold, a very special emotional reaction is triggered — romantic love.
一旦这个爱的账户达到一个标准的时候，一种特殊的感情反应就会发生——爱情。
The threshold level at which some kind of reaction can occur may be less than a thousandth of a potentially fatal dose, so where do you draw the line?
可能发生某种反应的临界值也许不到可能致命剂量的千分之一，那么，你在哪里划这条线呢？
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