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 problem of potential flows in an elliptical area with a circular central hole was solved by the substitution of similar flows in this paper.
图片说明：飞行蝗虫引起的空气流动模式(中间一列和右面一列)与计算机仿真预言的空气模式(左面一列)是相似的。
Image: patterns of air movement caused by a flying locust (middle and right columns) are similar to air patterns predicted by a computer simulation (left column).
同资产相似，债务也有两种主要分类：流动债务与非流动债务。
Similar to assets, there are two main categories of liabilities: current liabilities and noncurrent liabilities.
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