This article, from the perspectives of the function and form, ferretsout the rise and decline of the trisyllabic verse in Han and Wei dynasties and the close relation to the heptasyllabic verse.
三言在汉魏兴衰的原因可以归结为表现功能和体式原理两方面,并且与七言体有密切的关系。
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Why not? Most flu spreads when an infected person coughs or sneezes out droplets of irus. Ferrets infected with the altered 1918 irus didn't sneeze at all.