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非常感谢及时回复，对我很有帮助。 问题1：也就是说公式（4）（5）中的1/f是表示nabla算子的下标f，而不应该显示为1/f，是吧？ 问题2：后来参考“浅谈计算流体力学中的通量”一文，可以看到图中标有d。 明白了，谢谢！
