O字開頭的單詞或詞組
on the telephoneoscillateon holidayoperationalonetimeon saleophthalmologyoverallsorienteeringovereatoxidativeon the increaseoxideolfactoryonlookeroo-outnumberoverstresson tapoppressionoutwardlyocelotoverstateoutward-boundout of dangeromnivoreover-observerob-orificeorthopedicsorthogonalottooximeterolefinorioleon leaveoutside looponerousophthalm-opportunity costorder from
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- 8深淵
