471.to say nothing of(=not to mention)更不用说…
472.do sth. at short notice 只给很少时间准备
473.until further notice 在另行通知前
474.take notice of(=pay attention)注意
475.object to(=be opposed to)反对
476.objection to(接动名词)反对
477.on occasion(=now and then)不时地，必要时
478.by occasion of(=because of)由于
479.occupy oneself with(in)忙于(某事)
480.it occurs to sb. that… 某人想到…
481.once and for all=once and forever 永远地;all at once(=suddenly，now)立即，马上;once in a while (=occasionally)偶尔;(just)for once 就这一次
482.(all)by oneself 独自(没有别人帮助)
483.operate on sb. 给某人做手术;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 one’s opinion 按某人的看法
486.be opposed to… 反 对 …
487.be opposite to 与…相反的
488.(be)in order(=acceptable)合适的，恰当的;in order 井井有条，处于良好状态;out of order(=in bad condition)出毛病，发生故障
489.made to order 定做的(衣服)
490.originate in from(=begin)起源于，由..引起
