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各位老师前辈好，最近在学习CFD，这个方程是一个势流求解方程，其中框中的微分求导顺序有点看不明白，以η为例，第一个求导时候需要对括号里的进行求导吗，第二个对dφ求导时是一阶导数还是二阶导数啊，可以给指导一下吗？谢谢了
