O字开头的单词或词组
openingover alloverweightout of breathobiopen the door toon businesson balanceon top ofon footout of timeoiloutlookOhioonsetostrichosmanthusosteoporosisout of orderon the wholeorderlyofferingoptimistoblivionOslooreoozyoutlawowingoraorgohmon the tableover hereoatsoncologyoutwardokraover and overone-shotOrionoxymoron
