limestone cave 예문

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1. In 1872 they visited the limestone caves in the Dordogne and Aurignac.
2. The limestone caves were first described by Frederick Courtney Selous in 1888.
3. It is well known for its ancient limestone cave locally called Khangkhui Mangsor.
4. A notable feature are the many limestone caves found close to the coast.
5. Selma's Confederate Nitre Works procured niter for gunpowder from limestone caves.