常用英语短语
off and on 断断续续，间歇地
常用口语句子
It rained off and on all day.
整天断断续续地下着雨。
She cried off and on all day.
她整天不时地哭。
They don't go there often， just off and on.
他们不常去那里，只是偶尔去。
常用英语短语
off chance 微小的可能性
常用口语句子
There is still an off chance that the weather will improve.
天气转好尚有一线希望。
He came on the off chance of finding me at home.
他来找我时是想到我或许有可能正在家中。
There is an off chance of finding him at home.
在家里找到他的可能性很小。
常用英语短语
off duty 下班，不上班
常用口语句子
He is off duty.
他没上班。
I was off duty yesterday.
昨天我不当班。
I am off duty today.
今天我休息。
常用英语短语
on (an/the) average 平均，通常
常用口语句子
We fail one student per year on average.
我们平均每年有一个学生不及格。
On average we receive five letters each day.
我们平均每天收到五封信。
She spends on the average two hours a day on reading.
她平均每天用两小时读书。
常用英语短语
on a large/small scale大/小规模地
常用口语句子
This district grew cotton on a large scale.
这个地区过去大量种棉花。
The board of directors made the decision to produce the car on a large scale.
董事会决定大规模生产这种汽车。
He's in business on a small scale.
他做的是小本生意。
常用英语短语
on account of 由于
常用口语句子
We delayed our departure on account of the bad weather.
由于天气不好，我们将启程的时间推迟了。
The flight was postponed on account of bad weather.
因为天气不好，航班延迟了。
Innocent people get into trouble on account of others'misfortune.
城门失火，殃及池鱼。
常用英语短语
on behalf of sb./on sb'sbehalf 代表某人；为了某人的利益
常用口语句子
On behalf of my colleagues and myself I thank you.
我代表我的同事以及我自己向你表示谢意。
Ken is not present， so I shall accept the prizeon his behalf.
肯不在场，所以我代表他领奖。
He spoke on behalf of the plan.
他为这项计划辩护。
常用英语短语
on board 在船（车/飞机）上
常用口语句子
Have the passengers gone on board yet？
旅客已经上船/上飞机了吗？
When all passengers were on board， the train pulled out of the station.
所有乘客都上车后，火车开出了车站。
You'll have to take your luggage on board.
你得把你的行李拿到车上。
常用英语短语
on business 因公
常用口语句子
I'll be away on business next week.
下星期我要出差。
I am here on business as opposed to aholiday.
我在这里是办公事而不是度假。
I will go on business either this week or nextweek.
我将在这星期或下星期出差。
常用英语短语
on condition that 如果，在……条件下
常用口语句子
You can go out on condition that you wearan overcoat.
你要穿上外衣才能出去。
I'll come on condition that John is invited too.
如果约翰也受到邀请，我就来。
You can use the bicycle on condition that you return it tomorrow.
只要你明天归还，自行车你可以拿去用。
常用英语短语
on duty 上班，值班
常用口语句子
I go on duty at 8：00 am.
我早晨8点钟上班。
Who is on duty today？
今天谁值日？
I arrive at the hospital at eight o'clock， but I don't go on duty until nine.
我八点钟就到医院了，但是九点钟我才去值班。
常用英语短语
on earth 究竟，到底
常用口语句子
What on earth do you mean？
你到底是什么意思？
Why on earth didn't you tell me the truth？
你到底为什么不跟我说实话？
Everything is all right. What on earth are you crying for？
好好儿的，你到底哭什么？
常用英语短语
on fire 起火，着火
常用口语句子
The house is on fire！
房子着火了！
He suddenly cried out that the store house was on fire.
他突然叫道仓库着火了。
The house was on fire last night and was burned down.
那幢房子昨晚着火了，被烧为平地。
常用英语短语
on foot 步行
常用口语句子
We're going on foot， not by car.
我们走着去，不坐汽车。
The cinema is not far， you can get there on foot.
电影院不远，你可以走到那去。
He goes to school not by bus， but on foot.
他去上学不是乘公共汽车，而是走路去的。
常用英语短语
on hand 在场，在手边
常用口语句子
He has too much work on hand to go picnicking with us.
他手头的工作太多了，不能跟我们去野餐。
He had to make a shift with what was onhand.
他只好用现有的东西将就应付。
There weren't enough snacks on hand for the party.
现有宴会的点心不够用。
常用英语短语
on loan 出借的，暂借的
常用口语句子
I have the book on loan from the library.
我从图书馆借来这本书。
The book I wanted was out on loan.
我想要的那本书被借出去了。
She has a piano on loan from her friend.
她正在借用朋友的钢琴。
常用英语短语
on no condition 一点也不，决不
常用口语句子
You must on no condition tell him what happened.
你决不能把发生的事情告诉他。
You must on no condition climb that high wall！
你绝不能去爬那高墙。
You must on no condition tell her the secret.
你无论如何也不要向她泄露这个秘密。
常用英语短语
on occasion(s) 有时，间或
常用口语句子
You have on occasion surprised people.
你有时使人们感到诧异。
He forgot to do homework on occasion.
有时他忘了做家庭作业。
Jason likes to go drinking on occasion.
杰森有时喜欢去喝点儿酒。
常用英语短语
on one's own 独立；独自
常用口语句子
He can be left to work on his own.
工作可交给他一个人去做。
I'm all on my own today.
今天我是独自一人。
She lives on her own.
她独自过日子。
常用英语短语
on purpose 有意地，有目的地
常用口语句子
Did he break it accidentally？
他是无意中损坏的吗？
No， on purpose.
不，是故意的。
She seems to do these things on purpose.
她似乎是有意地做这些事。
I came here on purpose to see you.
我特地来这里看你。
282常用英语短语
on sale 出售，廉价出售
常用口语句子
The new model is not on sale in the shops.
这种新款式商店尚未出售。
There are some nice apples on sale in that shop.
那家商店有些很好的苹果出售。
These gloves were on sale for only $9.
这些手套减价卖9美元。
常用英语短语
on schedule 按时间表，准时
常用口语句子
The train arrived on schedule.
火车准时到达。
I have accomplished the task on schedule.
我按时完成了任务。
Please try to sail on schedule.
请尽量按时开船。
常用英语短语
on the contrary 正相反
常用口语句子
It doesn't seem ugly to me； on the contrary，I think it's rather beautiful.
我觉得它并不丑，恰恰相反，它挺美。
It wasn't a good thing； on the contrary it was a huge mistake.
这不是一件好事，恰恰相反，这是一个巨大的错误。
It isn't hot ； on the contrary it's cold.
天气并不热，正相反，天气很冷。
常用英语短语
on the double 迅速地，很快地
常用口语句子
Hurry or we'll miss the train， on the double.
快点，否则我们会错过火车，赶快！
Send a doctor here， on the double！
派个医生来，要快！
He wants to see you in his office on the double.
他要你赶快到他办公室去。
常用英语短语
on the grounds of 根据，以……为由
常用口语句子
He refused to adopt the plan on the grounds of its high cost.
他拒绝采纳这个计划，原因是成本太高。
The cutbacks are justifiable on the grounds of cost.
削减符合成本方面的考虑。
He was dismissed on the ground of negligence.
他因渎职而遭解雇。
常用英语短语
on the one hand 一方面
常用口语句子
On the one hand， I am your manager， andon the other， I am also your friend.
一方面我是你的经理，另一方面，我也是你的.
朋友。
One one hand， I have no time； on the otherhand， I have no money.
一则，我没有时间；二则，我没有钱。
On one hand he is believable，on the otherhe is reliable， too.
一方面他是可信任的，另一方面他也是可靠的。
常用英语短语
on the point of 即将……的时刻
常用口语句子
I was on the point of going to bed when yourang.
你来电话时我正要睡觉。
I was on the point of telephoning you.
我正要打电话给你。
It started raining when I was on the point of leaving home.
我正要离开家的时候开始下雨了。
常用英语短语
on the road 在旅途中，在路上；巡回演出
常用口语句子
There were loads of cars parked on the road.
路上停了很多车子。
I have been on the road since five o'clockthis morning and I'm really tired.
我今早五点就坐汽车上路了，现在实在累。
The band has been on the road for almost amonth.
那支乐队进行巡回演出近一个月了。