说明： 本程序采用对一个潮周期中每个潮流矢量的大小、方向分别在长短轴上进行分解，从而计算出其潮流椭率 (This procedure uses to one moist cycle in each tidal current vector size, the direction carries on the decomposition separately on the long minor axis, thus calculates its tidal current ellipticity )
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