这些现象每一个本身都是足够有害的，但是似乎都联结在了一起，通常表现为协同作用。
Each of these phenomena would be bad enough on its own, but all appear to be linked, usually synergistically.
半经典闭合轨道理论由于具有物理图像清晰、可近乎解析处理等特点被普遍用来解释原子或离子在强外场中的光吸收现象，成为实现联结经典理论和量子世界的重要桥梁。
Semiclassical closed orbit theory has been extensively used to explain the photo-absorption spectra of atoms in external fields due to its clear physical picture and wide availability.
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