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.

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。

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On the basis of analytical orbit theory, the state transition matrix from mean to transient orbit errors was put forward.

在解析轨道理论基础上，给出了平均轨道要素偏差到瞬时轨道要素偏差的状态转移矩阵。

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The article deals with the oil and rock mineral property according to the molecular orbit theory and the energy band theory of the solid material.

该文依据分子轨道理论和固体物质的能带理论，对石油及岩石矿物的荧光性成因进行了论述。

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This will push the dust through the orbits where space junk can be found, and the resulting drag will, in theory, disrupt the orbit of the small debris.

FORBES: Solving the Space Junk Problem -- With More Space Junk?

The team managed to show that Einstein's theory could give the correct orbital behaviour of the binary orbit.

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In fact, the relativistic offset correction Easton applied to that satellite is still used by every GPS satellite now in orbit, and it also helped to experimentally verify Einstein's theory of relativity for good measure.

ENGADGET: GPS pioneer Roger L. Easton inducted into National Inventors Hall of Fame