That is to say, epic poetry has been invented many times and independently; but, as the needs which prompted the invention have been broadly similar, so the invention itself has been.
也就是说,史诗被独立地创造了很多次;但是,由于推动这项发明的需求大致相同,所以这项发明本身也是如此。
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Independently
Epic
Broadly
Needs
Time