石炭系 Save Sign in to save words shítànxì ㄕˊ ㄊㄢˋ ㄒㄧˋ carboniferous system coal measure (geology) Character by character 石(shí)surname Shi 炭(tàn)wood charcoal 系(xì)connect A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0