本文介绍了实现几何构型的一个行之有效的方法——有向平面法。

This paper describes the method of the directional plane, an effective method to realize the geometrical construction.

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而使用新方法可以得到NC算法，且可以证明节点和边都有容量的有向平面网络中的最小截、最大流问题都是属于NC的。

It is proved that the minimum cut and maximum flow problems in directed planar networks with both node and edge capacities are both in NC.

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假如一个光子打向有两个狭缝的平面，假如有一个狭缝可以观测到，那它没有同时通过两个狭缝。

So if a photon (particle of light) is directed to a plane with two slits in it and either slit is observed, it will not go through both slits.

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But in sigma orbitals, you have no nodal planes along the bond axis, so if we had a nodal plane here, we'd see an area where the wave function was equal to zero.

但在sigma轨道里，沿着轴向是没有节点平面的，如果我们有个节点，我们就会看到某个地方波函数等于0。

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