河流转向东流时河道大幅度变宽。The river widens considerably as it begins to turn east.这些蜗牛体宽不超过1厘米。The snails are no larger than one centimetre across.尼罗河在此处变宽，从两块花岗岩巨石间穿过。Here the Nile broadens out between the huge granite boulders....