So let's think about methane using valence bond theory.
让我们用价电子成键理论来看一看甲烷。
So the idea behind valence bond theory is very easy to understand.
价电子成键理论，非常容易理解。
So, we can think about now how do we describe this bond in valence bond theory.
我们现在可以考虑，怎么在价电子成键理论中描述这个键。
Valence-bond theory was formed on the basis of the classical ideas of valence bond.
价键(VB)理论在经典的共价键理论基础上产生。
And to do this we're going to introduce valence bond theory, and the idea of hybridization of orbitals.
在这之前我们要引入价电子成键理论，和杂化轨道的概念。
Based on the valence bond theory, a general molecular formula for organic com - pounds is derived.
本文根据价键理论导出了一个有机化合物的分子总通式。
All right, so that's really all there is to thinking about valence bond theory in terms of the most simple explanation here.
好了，这就是，价电子轨道理论的，最简单的解释。
This paper analyzes shell electron pair repulsion theory , valence-bond theory and molecular orbital theory on molecular structure of noble gas compounds.
对稀有气体化合物的分子结构分别用“价层电子对互斥理论”、“价键理论”和“分子轨道理论”进行了分析处理。
The relative stabilities of intermediate compounds and titanium monoxide were examined deeply with quantum chemistry, crystal field and chemical bond theory.
运用量子化学、晶体场及化学成键理论，深入分析了中间化合物及一氧化钛的相对稳定性。
In valence bond theory, the focus is on discussing the bonds, but it should look very familiar to you, because there's two types of bonds that we want to discuss here.
在价电子成键理论中，所关注的是讨论成键，但这对于你们来说应该很熟悉，因为这是我们要讨论的两种键。
According to the chemical bond theory, the new function of bond parameters, which provides theoretical basis for the selection of alloying elements, has been derived.
根据化学键理论，推导出新的键参数函数图，为合金化元素的选择提供了依据。
Theoretical foundation: enterprise bond theory, new viewpoint of proprietary rights, principle of allocation according to contribution, the importance of human capital.
企业契约理论、新所有权观、按贡献参与分配收益原则、人力资本的日益重要性是利益相关者参与公司治理的理论基础。
So, using our simple valence bond theory, what we would expect is that we want to pair up any unpaired electrons in methane with unpaired electrons from hydrogen and form bonds.
利用简单的价电子成键理论，我们预计，要把所有甲烷中没有配对的电子，和氢原子中没有配对的电子配对来形成键。
At some point they will be travelling so fast that the way they bond will be affected by Albert Einstein's theory of relativity, which departs from classical theories at speeds close to that of light.
从某种意义上看，根据爱因斯坦相对论(当达到接近光速的速度时，相对论就背离了经典理论)，电子运动速度加快，电子间相互结合的方式就会受影响。
in theory the fire in the bond markets could be doused by fiscal transfers and the mutualisation of debt.
理论上讲，债券市场过热可以通过财政调拨和债务互助来进行调控。
And in theory, it could find creative ways to do the same for the corporate-bond market.
并且理论上，它可以找到创造性的办法在企业债市场复制这样的角色替换。
For the fundamental position of the pricing theory of the credit risk in the studies on the credit risk of corporate bond, firstly, the pricing theory is analyzed.
由于信用风险债券的估价理论在企业债券信用风险的研究中始终处于基础理论的位置，本文在第一部分先对有关信用风险债券的估价理论进行评述。
The fundamental idea of dynamic modelling of complex spacecraft system using Bond Graph theory, and the procedure of using Lagrange Bond Graph are discussed.
介绍了键图理论应用于建立复杂航天器系统的动力学模型的基本思想以及拉格朗日键图的具体应用步骤。
In the preceding section we discussed the valence bond ( vb) or electron-pair theory of bonding.
在前面一节，我讨论了价键法&电子配对理论。
The existing catastrophe bond pricing models are all based on the standard finance theory.
现有的巨灾债券定价模型是基于标准金融理论建立的。
Natural bond orbital analysis shows that these H-bonds can be interpreted with the theory of inter-and intra-molecular hyperconjugation and rehybridization.
自然键轨道分析表明分子内与分子间超共轭和重杂化理论可以解释这些氢键的形成机制。
Aim the convertible bond value is analyzed on the basis of the traditional theory and its value formula has been given.
摘要目的在传统的可转换债券定价理论的基础上分析可转债的价值，给出了其价值确定公式。
According to the theory of mechanical bonding, layer-to-layer bond strength was improved by making the surface become more roughness.
本文分析了光固化树脂层间结合机理，根据机械结合理论，增加表面粗糙度，增强层间结合强度。
The bonding theory explains the difference of hydrothermal stability of leathers tanned by various mineral-tanning agents according to their bond strength to collagen.
价键理论根据鞣剂与胶原活性基团形成配位键的强弱，解释各种无机鞣剂鞣革性能的差异。
It shows, it is practicable to set up a systematic dynamic model of floating automatic gun with the bond graph theory.
对比表明，计算结果和实测结果基本相符，这说明用键合图理论建立火炮浮动自动机的动力学模型是可行的。
Based on bond graph theory, the bond model of a road smoothness measuring equipment vibration has been set up, and the state equation and the dynamic simulation program established.
应用键合图理论建立了路面平整度仪振动系统的键合图模型，并推导出状态方程，编制了动态仿真程序。
And it concludes that computer simulation, optimization theory and bond graph are available to the design of the powertrain.
总结了将计算机模拟计算、优化理论、键合图理论应用到汽车动力传动系的设计中的实用性。
The Bond-space theory is the development of the bond graph theory of system dynamics.
键合空间理论是系统动力学键合图理论的拓展。
Theories on bond pricing include classical interest rate theory, liquidity preference theory, loanable fund theory and reasonable expectation theory.
债券价格的决定理论主要有古典利率理论、流动偏好理论、可贷资金理论和理性预期理论。
Whereas in molecular orbital theory, what I'm telling you is instead we understand that the electrons are spread all over the molecule, they're not just associated with a single atom or a single bond.
而在分子轨道理论里，我要告诉你们的时，我们任为电子分布在整个分子中，它们不仅仅是和，一个原子或者一个键有关。
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