large chamber

大跨度硐室,wide... ... ) Shallow-lying large span opening 浅埋大跨硐室 ) large chamber 大型硐室 ) big chamber 大硐室 ...

大断面峒室,large... ... ) large section cavern 大断面硐室 ) large chamber 大断面峒室 ) Chamber bulk blasting 峒室大爆破 ...