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swallow hole

noun

🔊/ˈswɒləʊ həʊl/

🔊/ˈswɑːləʊ həʊl/

(also sinkhole)

(geology地质学)

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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）