Bear in mind that the chief ray is now principal ray.

记住，此时主光线就是主点光线。

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Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.

本文从光线轨迹方程出发，推导了锥形梯度折射率纤维的物像关系式，并得出了它的等效焦距和主平面位置。

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X-ray Crystallography is the principal method by which the detailed 3 - dimensional structures of molecules - especially the molecules of living systems - have been discovered.

射线晶体学是研究分子详细的三维结构的主要方法——特别是已经发现的活体系统的分子。

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"I wouldn't be surprised as we move uphill that we find a section of the rock, in fact, that was modified in a shallow open-water environment, " said Ray Arvidson, rover deputy principal investigator and a geologist at Washington University in St.

CNN: Mars rovers working overtime

Its top public relations executive, Ray O'Rourke, served as principal crisis counselor to now-defunct Pan Am when Libya downed its Flight 103 over Lockerbie, Scotland, in 1988, killing all 270 on board.

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