本文主要从五个部分来论述杨嗣昌。
The thesis mainly falls into five parts to discuss Yang Sichang.
杨嗣昌所处的时代正是明王朝走向崩溃的时期。
Yang Sichang was lived in a crucial period when the Ming Dynasty was drifting to overall collapse.
目前史学界对杨嗣昌的研究非常薄弱，有加强研究的必要。
Historians of the Yang Sichang present study is very weak, there is the need to strengthen research.
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