O字開頭的單詞或詞組
on leaveorthopedicsobscurityornateoverhearoscillateon holidayophthalmologyown tooverstateorienteeringoxidativeon one's toesorganizationalopen seaorificeovershadowoversightoverageonerousout-of-pocketoverflewointmentoil pump purifieroff-keyoatmealout of characterombudsmanomnivoreon the matocelotolefinoutbackolfactoryobjectionableon the houseoverrateon the way tooutcryonshoreovertakenoctane
