显然，波里比阿的实用史观是西方古典史学传统和希腊罗马文化交融时代共同作用的产物。
Obviously, pragmatic concept of Polybius is a product of the tradition of western classical historiography and the culture blend between Greek and Rome.
以上对于黑洞的描述，仅仅将光当做是古典的电磁波。
So far this description of black holes has treated light as a classical electromagnetic wave.
主要研究了热方程与波方程的非古典势对称群生成元及相应的群不变解。
Some nonclassical potential symmetry generators and group-invariant of heat equation and wave equation were determined.
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