open onto . have an opening or outlet to；give access to通往；有出口和…相通
All the rooms open onto a long hall．所有房间都和长廊相通。
The French windows open onto the garden．落地长窗通往花园。
open out . become wider，esp．of a road，river，变宽；打开
at the foot of the mountain，the river suddenly opens out into a broad estuary．这条河流经山脚时突然向宽阔的港湾伸展开去。
open out . develop发展；发育
In the warmth of the room，the roses opened out in a few days．在室内温暖的空气中，玫瑰几天内就开花了。
Her good qualities opened out as she grew in years．她的优秀品质随着年龄的增长而更趋完美。
open out . become visible over a wider area 展现；显示
As we climbed higher，a wonderful view opened out before us．当我们再爬高一些时，一派美好的风光展现在我们眼前。
Just over the hill the countryside began to open out，and we had our first glimpse of the sea．就在山那边我们看到了乡村的景象，而且第一次看见了那片大海。
open out . become less shy or nervous in public变得不那么害羞；直言；畅谈
He's opened out a lot since he went to university．上大学后他健谈多了。
They opened out to each other．他们相互畅谈。
open somebody 's eyes . make somebody see使某人明白
That incident opened my eyes to the trust character of the man．那次事件使我认清了这个人的真正品质。
Mary didn't believe that her cousin could be mean until the cousin opened Mary's eyes by scratching and biting her．玛丽不相信她堂弟如此卑鄙，直到他抓伤并咬了她，她才看清事实。
She couldn't understand that until her brother opened her．eyes．她不能领会，后来还是她哥哥使她明白了。
open the door . give a chance提供机会
The success of the operation on his legs opened the door to a whole new life for him．他腿部手术的成功给他带来了新生活的希望。
This agreement opens the door to advances in every field．这个协议为各方面的发展创造了条件。
Higher education opens the door to a better jobs．高等教育为寻求较好职业创造了条件。
open to . liable to易接受…的
He is open to temptation．他容易受诱惑。
His remark is open to misinterpretation．他的话容易被人曲解。
open up . unwrap；undo（a parcel，）打开；解开
The surgeon opened up the man's stomach to get at the source of the trouble．外科医生切开了这个人的胃来查清病源。
Open up the boot of the car，and let me look inside．打开汽车的行李箱，让我看看。
open up .begin to fire开火；发动攻击
We held our ears as the machine guns opened up．机枪开火时我们堵住了耳朵。
Our players opened up with forward passes．我方球员向前传球，发动了攻势。
open up . make clear；reveal揭示
After hours of grilling the prisoner opened up．几小时的审讯后，犯人终于把秘密说了出来。
Einstein's theories opened up a whole new area for study．爱因斯坦的理论揭示了一个全新的研究领域。
open up . make something available for use or development开发；开辟
The building of the railway opened up new land to the pioneers．铁路的建成为先驱者们开辟了新的土地。
We're being forced to move because the council wants to open up the whole area for redevelopment．我们只好搬家，因为委员会准备对这个地区再开发。
open up . talk frankly and honestly直率、坦诚地说
After a few drinks he opened up and told us all his problems．酒下肚后，他才开口说话，把他所有的问题都告诉了我们。
After John trusted Mr．Jones，he opened up and told him how he felt．约翰信任琼斯先生之后，便与他直言相谈，告诉他自己的感受。
open up . develop，arise or emerge，esp．of possibilities，prospects，opportunities变得有可能；出现（机会）
Quite unexpectedly a chance has opened up for Henry to go and work abroad．出乎意料，亨利得到了去国外工作的机会。
open up . open the door开门
Mother，open up！I'm home．妈，开门！我回来了。
open up . speed up,加速
He opened up and drove straight towards the stadium．他加快车速，直驶体育场。
When they got out on the highway，the driver opened up and drove at sixty miles per hour．他们一上公路，司机便加快车速，车速竟达每小时六十英里。
operate on . perform a surgical operation on给…开刀
They operated on him for a tumour．他们为他施行了切除肿瘤手术。
How many wounded soldiers are there who haven't been operated on yet? 那儿还有多少伤员没有动过手术?
or else . if not；otherwise否则
Do what I tell you，or else you'll be sorry．照我的话做，否则你要后悔的。
or other . used to emphasize indefinite words or phrases beginning with“some”（as somebody ，something，somewhere，somehow，sometime）（用以表示不肯定或不准确之意）某一
I shall be coming again some day or other．我总有一天还会来的。
I've read the story before in some book or other．我以前在哪本书上读过这个故事。
Somehow or other，John managed to get a well paid job in the bank．不知怎么地，约翰在银行找到了一份薪水高的工作。
or rather . It would be better to say更确切地说
He came home very late last night，or rather very early this morning．他昨天深夜，或者更确切地说，今天凌晨才回家。