The principles of laser frequency transformation and the theory of phase matching in nonlinear optic crystals are also discussed. Based on this theory, Angle of phase match is calculated.
WENXIAN TONGKAO summarized the transformationof institutions by wide historical angle of view, afforded reference for the real society.
《文献通考》从更为开阔的历史视角总结典制因革，为经世之用提供制度模式的参照；
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This text analyzed the legislative transformationof the social transformation from the interactive relation angle between social transformation and law transition.