o
on sale 减价销售
one in a million百里挑一
out of question没问题
once and for all最后一次,干脆
out of earshot不在听力所及范围
out of this world非常好
on pins and needles如坐针毯
out of breath 上气不接下气
out of one’s mind发疯
out of stock 没有存货了
out of print绝版
out of the question不可能