O
of ones own choice 由自己选择
off the top of ones head 毫无准备
office hour 工作时间
on the average of 平均
on account of 由于
on and off 断断续续的
on behalf of 代表
on duty 值班，工作
on earth 究竟
on no account 决不
on purpose 故意
on sale 降价出售
on the average 平均起来，平均算
on the basis of 在基础上
on the bottom 在下面/底下
on the contrary 相反
on the phone 正在打电话
on the rocks 遇到困难，失败
on the spot 当场
on the whole 总之，总的来说
on vacation 度假，休假
on weekdays 在工作日
one in a million 凤毛麟角，百里挑一
one s cup of tea 某人的喜好，兴趣，口味
once in a blue moon 很难得，几乎不可能
other than 而不是
out of breath 上气不接下气
out of control 失去控制
out of date 过时
out of order 出了毛病
out of print 没有重印
out of question 没问题
out of stock 没货
out of the question 不可能
out the cart before the horse 本末倒置，主次颠倒
owe to 归功于
owing to 由于
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