ьetro n
archit.	★ 大城市中的地下铁道; ★ 地铁
English thesaurus
ETRO abbr.
abbr.	Estimated Time Return to Operation
abbr., avia.	estimated time of returning over base; estimated time for return to operation
abbr., med.	European Thrombosis Research Organization
mil.	estimated time of return to operation