群体选择理论是说：进化可以通过生命体整个群体的生存能力差异来产生，而不是个体的生存差异。 这一理论之所以被否定是因为从数学上看它不太可信。
The idea that evolution can work by the differential survival of entire groups of organisms, rather than just of individuals, was rejected because it is mathematically implausible.
首先应用耦合波理论对体全息光栅的衍射效率以及角度选择性和波长选择性等衍射特性进行了分析。
First, the properties of volume holographic grating, such as diffraction efficiencies, Angle and wavelength selectivity, have been theoretically analyzed by using the couple-wave theory.
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