《明史·志·卷五十九》
还有人甚至认为： 沙湾水流急速，石铁沉下就像羽毛一样，不是用人力可以治理的。
甚者言： 沙湾水湍急，石铁沉下若羽，非人力可为。
Some even thought: The water in Shawan was flowing fast, stones and iron sank like feathers, it was not something humans could control.