排在榜单三甲位置的发明都是医学领域的重大发明或发现。 紧随X光机之后的是盘尼西林(青霉素)的发明，以及DNA双螺旋结构的发现。
The firstthree positions were filled by medical inventions or discoveries,the X-ray machine being followed by the discoveries of penicillinand the DNA double helix structure。
大多数重大发现和发明都是偶然的：通常情况下人们为了某个问题寻找答案，却在这一过程中找到了另一问题的答案。
Most important discoveries or creations are accidental: it is usually while seeking the answer to one question that we come across the answer to another.
然而，如果翻阅一下历史记载，你会发现许多重大发明都经历了漫长的孵育过程。
But if you look at the historical record, it turns out that a lot of important ideas have very long incubation periods.
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