For example, the tidal estuary of the water level there to half a day or a Taiyin for the cycle, changes in river water rich in each of the flood water and less Kuji;

• 例如，潮汐河口的水位存在以半个或一个太阴日为周期的日变化；河流每年出现水量丰沛的汛期和水量较少的枯季；