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on the two sides 两边

on the whole 整体上

on time 准时、按时

once a while 有时、偶尔

once again 再次、又一次

once in a while 偶尔、有时

once more 再次、又一次

once upon a time 很久以前

one after another 一个接一个

one and a half years 一年半

one another 互相、彼此

one day 某一天

one person in ten 十个人中有一个

one person out of ten 十个人中有一个

one such+n. 这样一个……(名词用单数)

one's attitude to/towards sth. 某人对……的态度

one-sided view 片面的看法

only to find 结果却发现

only/but/all too pleased/happy/thankful to do 做……太高兴/感谢了

operate on sb. 给某人做手术

operation on sp. 在某位置动手术

opposite direction 相反方向

or rather 或者说、更进一步说

order (that) sb. (should) do 命令某人应该做某事(虚拟语气)

ought not to have done 不应该做(却做了)

ought to have done 应该做(却没做)

out of breath 上气不接下气

out of one's reach 够不着

out of order 坏了、无秩序、乱放

out of the reach of sb. 某人够不到

over and over again 一次又一次、再三

over the radio 从收音机里

over the years 这几年里

owe one's success to sb. 把某人的成功归功于别人

owe one's thanks to sb. 感谢某人

owe sb. sth. 欠某人某物

owe sth. to sb. 把……归于……

pass away 病故、病逝

pass down 继承、传下去

pass on a message to sb. 给(收信人)留/传个信

pass on 传递

pass the exam 考试及格

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