在摄动理论中，一种假设的接近于天体真实运动的、能列出解析表达式的轨道。在天体力学分析方法中，一种比较成熟的摄动理论是以二体问题作为第一近似（或称零阶近似），然后在此基础上用迭代过程求各阶摄动变化，从而得到具有一定精度的解。但是，二体问题往往离真实情况甚远，这就使得留下的摄动量太大。因此，人们想寻找一种更接近真实运动的中间轨道来代替椭圆作为第一近似。
中间轨道
双语例句原声例句
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求解需要速度时，实时地考虑了地球扁率的影响，并给出了利用中间轨道法求解需要速度的过程。
When solving required velocity, it real-timely thinks about influence of oblateness of the earth and gives the process of solving required velocity by midcourse trajectory method.
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右图中的球是围绕碳原子的电子云的图像。 它们分别是径向对称的球和中间有节点的双扁球形状，就像s和p原子轨道给出的电子密度图。
There’s a radially symmetric blob, and a double-lobed blob with a node in the middle – just like the patterns of electron density that the s and p atomic orbitals give rise to.
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为了建设快速公交，该市把主要的林荫大道中间的2个到4个车道征用，用低矮的墙隔离开，就建立了快速公交的所谓轨道。
To create TransMilenio, the city commandeered two to four traffic lanes in the middle of major boulevards, isolating them with low walls to create the system's so-called tracks.
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So again, this is an anti-bonding orbital, and what you see is that there is now less electron density between the two nuclei than there was when you had non-bonding.
同样的，这是反键轨道，你们看到当你有反键轨道的时候,两个原子核中间的电子密度更小了。
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If we overlay what the actual molecular orbital is on top of it, what you see is that in the center you end up cancelling out the wave function entirely.
如果我们把真实的分子轨道覆盖在上面，你可以看到中间的,波函数是完全抵消掉了。
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The reason that there is increased electron density here is you can see that these two orbitals come together and constructively interfere.
你们可以看到两个轨道,靠在一起相长叠加,这就是为什么中间的电子态密度增加了。
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