main fault system窒: stop up; obstruct; suffocate ...层: I storey; tier; stratum系: system; series窒层: main fault; mainfault; major fault; majorfault层系: bed series; layer system; measures; series of strata; seriesofstrata; system of beds下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:窒层系，即可在微信中查询翻译
