sinkholen.
英 'sɪŋkhəʊl
中文n. 污水坑；排水口；阴沟口
词根词源
sinkhole (n.)also sink-hole, mid-15c., "sewage pit," from sink (n.) + hole (n.). As a geological phenomenon, "hole made in the earth in limestone regions by underground erosion," 1780, from sink (v.).
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