尼古丁是一种尤其高活性的分子。

In particular, nicotine is a highly flexible molecule.

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它们没有和糖中的碳反应形成二氧化碳，而是形成了高活性的分子，称之为：自由激进分子。

Instead of reacting with carbon from the sugar to form carbon dioxide, it forms highly reactive molecules called free radicals.

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金属催化剂是高活性的，但一旦它们发生了反应就很难分离出去，留下微小的杂质可能影响芯片的性能。

Metallic catalysts are highly active, but they're difficult to remove once the reaction is done, leaving small impurities that can nonetheless interfere with a chip's performance.

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So if you're trying to make a more complicated organic molecule carbon-carbon bonds are one of the most difficult things to make in organic chemistry, and it turns out that c n minus is a very reactive molecule, so it's a good way, even though we'll go over some drawbacks in a second, it is a good way to make carbon-carbon bonds.

如果你要合成一个更复杂的有机分子,碳碳键是有机化学中,最难制造的键之一，而实际上氰离子是一种具有很高活性的分子，用它是一个好办法，尽管我们一会儿将看到它的一些缺点，但它的确是一个制造碳碳键的好方法。

麻省理工公开课 - 化学原理课程节选