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sinkhole

noun
🔊/ˈsɪŋkhəʊl/
🔊/ˈsɪŋkhəʊl/
(also less frequent swallow hole)
(geology地质学)
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  1. a large hole in the ground that a river flows into, created over a long period of time by water that has fallen as rain落水洞（在地下，雨水长期渗落形成）