전철subway; subway train; metro 지하철subway 지하철역subway station 철도rail; railroad 철판griddle; iron plate 강철steel 강철봉steel bar 강철판steel sheet; steel plate 경전철light rail 고속철high-speed rail; high-speed train

탄광coal mine; pit 탄광촌coal-mining town 폐광closing a mine 광공업mining and manufacturing 광맥mineral vein 광물mineral 광물성mineral 광물질mineral matter 광부miner 광산mine

금강석diamond 보석jewel 비석tombstone; monument 석류pomegranate tree 석유oil; petroleum 일석이조killing two birds with one stone 초석cornerstone; foundation stone 치석tartar; scale; plaque 타산지석learning from someone else's mistakes; lesson from someone else's failures 탄생석birthstone