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)
