我们经常用“鸿沟”比喻事物间明显的界线,其实在历史上,“鸿沟”是真实存在的,它本是战国时开凿的一条运河。“鸿沟”故道从荥(xíng)阳北引黄河水,经中牟、开封、通许、太康、淮阳,入于颍水。但在刘、项相争的过程中曾一 We often use the “gulf” to describe the obvious boundary between things. In fact, in history, “gulf” is real. It was originally a canal cut during the Warring States Period. “Divide ” The old road leads to the Yellow River from Yang (xíng) north, by Zhongmu, Kaifeng, Tong Xu, Taikang, Huaiyang, into Ying water. However, in the process of Liu, one item was contested