oxbow lake
noun [ C ] geography specialized uk/ˌɒks.bəʊ ˈleɪk/ us/ˌɑːks.boʊ ˈleɪk/
牛轭湖（当河流出现新的、更直的流向时，原有的河流弯曲处分离形成湖泊）
a curved lake that was originally a bend in a river but became separated when the river took a new, straighter course
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