Ø to say nothing of (=not to mention)更不用说…
　　 Unemployment leads to a sense of uselessness, to say nothing of financial problems.
　　 Ø do sth at short notice 只给很少时间准备
　　 There’s no one available at such short notice to take her class.
　　 Ø until further notice 在另行通知前
　　 The bad news was that all flights to Lanchow had been cancelled until further notice.
　　 Ø take notice of (=pay attention) 注意
　　 We want the government to take notice of what we think they should do for single parents.
　　 Ø object to (=oppose to) 反对
　　 A lot of people will object to the book.
　　 Ø objection to (接动名词) 反对
　　 He has a strong objection to getting up early.
　　 他强烈反对早起。
　　 Ø on occasion(=now and then)不时地,必要时 If something happens on occasion, it happens sometimes, but not very often.
　　 He treated them seriously and, on occasion, entertained them hilariously.
　　 Ø by occasion of (=because of) 由于
　　 The football match was postponed be occasion of rain.
　　 Ø occupy oneself with (in) 忙于(某事)
　　 I occupied myself with all kinds of paint testing.
　　 Ø it occurs to sb that… 某人想到…
　　 It occurred to me that I could have the book sent to me.
　　 Ø once and for all 永远地 一劳永逸地，彻底地
　　 If something happens once and for all, it happens completely or finally.
　　 We have to resolve this matter once and for all.
　　 Ø all at once (=suddenly, now) 突然
　　 I have to go, I really must, at once.
　　 Ø once in a while (=occasionally) 偶尔
　　 If something happens once in a while, it happens sometimes, but not very often.
　　 Your body, like any other machine, needs a full service once in a while.
　　 Ø operate on sb 给某人做手术
　　 The doctors operated on her stomach.
　　 医生给她的胃动了手术。
　　 Ø come/ go into operation开始运转
　　 When a rule, system, or plan comes into operation or you put it into operation, you begin to use it.
　　 Ø put/bring sth into operation 使…投产,运转
　　 Cheaper energy conservation techniques have been put into operation in the developed world.
　　 Ø be of the opinion 持有…的看法
　　 If someone is of the opinion that something is the case, that is what they believe. (FORMAL)
　　 Frank is of the opinion that the 1934 yacht should have won.
　　 Ø in one’s opinion 按某人的看法
　　 Well he’s not making a very good job of it in my opinion.
　　 Ø be opposed to… 反对…
　　 My mother is opposed to the new plan.
　　 我妈妈是反对这个新打算的。
　　 Ø be opposite to 与…相反的
　　 Her house is opposite to mine.
　　 她的房子在我的房子对面。
　　 Ø (be) in order井井有条,处于良好状态;
　　 Now he has a chance to put his life back in order.
　　 Ø out of order(=in bad condition)出毛病,发生故障
　　 A machine or device that is out of order is broken and does not work.
　　 Their phone’s out of order.