Where the sediment supply was big enough, and the ocean was calm enough, the dropped dirt piled up, eventually forming new land that both lengthened the river and divided it in two.

在沉积物供应足够大、海洋足够平静的地方，堆积的泥沙堆积起来，最终形成新的土地，既延长了河道，又将它一分为二。