Because of the continuity of the flow, the stream function is introduced and it makes that the numbers of the fluid dynamical basic equation is cut off one.

由流动的连续性引进了流函数，使流体动力学基本方程的未知量的个数减少一个；

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Because of the continuity of the flow, the stream function is introduced and it makes that the numbers of the fluid dynamical basic equation is cut off one.

由流动的连续性引进了流函数，使流体动力学基本方程的未知量的个数减少一个；

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