《宋史·列传·卷九十七》
然而要实行的事情，大家都知道它的困难，汴水浑浊，自有百姓以来，不用来种植水稻。
而所行之事，道路皆知其难。汴水浊流，自生民以来，不以种稻。
However, everyone knows the difficulties of implementing the real things. The Bian River is muddy. Since its existence, it has not been used to grow rice.