475.object to 反对
476.objection to 反对
477.on occasion 不时地,必要时
478.by occasion of 由于
479.occupy oneself with 忙于
480.it occurs to sb. that... 某人想到
481.once and for all = once and forever永远地
all at once 立即,马上
once in a while 偶尔
for once就这一次
482. by oneself 独自
483.operate on sb. 给某人做手术
operation n.come/ go into operation 开始运转
put/bring sth. into operation 使投产,运转
484.be of the opinion 持有的看法
485.in ones opinion 按某人的看法
486.be opposed to... 反对
487.be opposite to与相反的
488. in order 合适的,恰当的in order井井有条,处于良好状态;out of order 出毛病,发生故障
489.made to order 定做的
490.originate in/from 起源于,由引起
491.on the outskirts 在城郊
492.owe...to 把归于
493.on ones own 单独
494.of ones own某人自己的
495.keep pace with 跟齐步前进
496.go to great pains = take pains下功夫,努力
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