石炭系

shí tàn xì

Maʼnosi

carboniferous system; coal measure (geology)

Ilovada oʻrganish → Chiziq tartibida yozish

Iyerogliflar

石shístone, rock, mineral厂口炭tàncarbon, charcoal, coal山灰系xìsystem; line, link, connection丿糸