oxbow lake

劍橋詞典

a curved lake that was originally a bend in a river but became separated when the river took a new, straighter course
牛軛湖（當(dāng)河流出現(xiàn)新的、更直的流向時(shí)，原有的河流彎曲處分離形成湖泊） 返回 oxbow lake