地理词汇(五):delta三角洲/mouth, ria河口/flord峡湾/current, watercourse水流/stream, brook小溪/torrent湍流山溪/rapids急流/source源头spring泉/bed河床/flood洪水/swelling, freshet河水猛涨/basin流域,盆地/waterfall,cascade瀑布/cataract大瀑布/tributary支流/confluent汇合点/meander河曲 ​