反转一个键的性质，这样一来素材中先前是键出的将变为键入，反之亦然。

Reversing the polarity of a key, such that material formerly keyed out will be keyed in, and vice versa.

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以化学键为基础建构了键连接性指数及分子键连接性指数，该指数同时考虑顶点原子的化学特征及键的性质。

The bond connectivity topological index s I based on chemical bonds is defined and the molecular index s is formed by s I according to the properties of the top atoms and their bonds on the study.

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本文讨论了在气固界面上化学吸附键的性质，并指出热力学方法具有能准确给出一系列化学吸附参数的不可替代的重要性。

This paper studies the nature of chemisorption bond and points out that the thermodynamic mic method is irreplaceable in giving parameters of chemisorption.

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And the reason we didn't do that is because we're actually going to spend much of the rest of the course relating these different properties to the properties of molecules in terms of bonding, and also in terms of chemical reactions.

我们至今没有这样做的原因是,实际上我们这门课程以后的大部分时间都将花在,如何将这些性质与分子的性质联系起来,在成键以及化学反应的方面。

麻省理工公开课 - 化学原理课程节选