Monetary currency substitution refers to foreign monetary currency replacing domestic currency in one or several area.
货币替代是指外国货币在本国境内替代本国货币来行使货币的某一种或某几种职能的现象。
The problem of potential flows in an elliptical area with a circular central hole was solved by the substitution of similar flows in this paper.
本文利用相似流动替换方法，解决了中心有圆孔的椭圆形区域内的位势流动问题；采用分区域解法，给出了中心有椭圆孔的椭圆形区域内位势流动问题的解析通解。
The general analytic solution for the potential flow in an elliptical area with a coaxial elliptical hole was found by combining similar flow substitution and flow area division.
采用分区域解法，给出了中心有椭圆孔的椭圆形区域内位势流动问题的解析通解。
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