(2) Pi Rixiu's viewpoint in the second material is reasonable. Because of his dialectical view of the problem, he not only pointed out that the demise of the Sui Dynasty was closely related to the Grand Canal, but also pointed out the far-reaching influence of the Grand Canal and its achievements in benefiting future generations.
(3) The original intention of digging the Grand Canal was to satisfy the playful lust of Emperor Yang Di; Digging the Grand Canal requires a lot of coolies, consumes a lot of manpower, material resources and financial resources, and arouses people's antipathy.