《庄子·外篇·秋水》
秋天的洪水随着季节涨起来了，千百条江河注入黄河，直流的水畅通无阻，两岸和水中沙洲之间连牛马都不能分辨。
秋水时至，百川灌河。泾流之大，两涘渚崖之间，不辩牛马。
The flood in autumn rose with the seasons, thousands of rivers poured into the Yellow River, and the water flowed directly without hindrance. Cattle and horses could not be distinguished between the two banks and the sandbars in the water.