煤层气 méicéngqì coalbed methane Definitions Defs Origin Strokes Stroke Words Sentences Sents 煤层气 煤層氣 méicéngqì coalbed methane gas trapped in layers of coal underground Frequency Written text 1.25 per million Sources Frequency data BCC Corpus (BLCU)
煤层气 煤層氣 méicéngqì coalbed methane gas trapped in layers of coal underground Frequency Written text 1.25 per million Sources Frequency data BCC Corpus (BLCU)
