The non-symmetric refracted flow is possible to correspond to the non-symmetric entrance condition of upstream cross before sudden expansion section, and also to the symmetric entrance condition.
这种非对称折冲流动可能与上游突扩前断面非对称入口条件相对应，也可能与上游突扩前断面对称入口条件相对应。
For more information on it, see the "HISTORY EXPANSION" section in the bash man page.
有关历史扩展的详细信息，请参阅bash帮助页中的“历史扩展”一节。
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