karst
(geology) A type of land formation, usually with many caves formed through the dissolving of limestone by underground drainage.
(transitive) To remove a mask from. / (transitive) To uncover.
plural of heterohybridoma
urea
私たちは川沿いのカルスト地形を探検して、いくつかの隠れた洞窟を発見しました。
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