billabong
noun [ C ] uk/ˈbɪl.ə.bɒŋ/ us/ˈbɪl.ə.bɑːŋ/
（旧时只有雨季才有水的）干涸河床
In Australia, a low area of ground that was part of a river in the past and that only fills up with water from the river during a flood.
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