淮河

淮河历来被视为划分南北气候与文化的界线：麦与稻、干与湿、口音与口味，常在此一带发生转折。水患与运河工程交织，使它既是自然边界，也是政治工程。

The Huai long marked a turn between northern and southern climate and culture—wheat and rice, dry and wet, accents and kitchens shifting along its reaches. Floods and canal works made it both a natural hinge and a political project.

教「之间」的地理：河是枢纽，不是背景。可与阴阳概念轻触并读——南北不是对立口号，而是一条河两侧逐渐变化的生活。

Teach “between” geography: a river as hinge, not backdrop. Touch Yin-Yang lightly—north and south are gradients of living, not slogans.