look about .look around . be on the watch；be on the lookout提防；留心；注视；戒备
When you ride in the street you must look about lest you bump into someone．在街上骑自行车时，你必须留神四周，免得撞着别人。
Look about before you cross the street．过马路前，要四下看看。
look about .look around . turn one's eyes to；go about observing in（a country，town，）观察；察看；游览
They spent two months in New York looking about the city．他们在纽约花了两个月的功夫游览该城。
The boy looked about with great interest．这男孩怀着极大的兴趣四周看看。
look about .look around . inspect or survey（moving about while doing so）视察；调查
You must look about before making the decision．你得考虑好了再作决定。
look about .look around . search around 四处寻找
I'm looking about for a house．我正在找房子。
For a whole month Bill went here and there，looking about for a job．整整一个月，比尔到处奔波找工作。
look after . take care of；attend to照顾
John's mother told him to look after his younger brother．约翰的母亲告诉他好好照顾弟弟。
She has looked after her elderly parents for many years．多年来她一直照顾她年迈的父母。
When he went to Europe，Mr．Jenkins left his son to look after the business．詹金斯先生去欧洲时，把生意交给儿子照管。
look after . follow（a departing person or thing） with the eye 目送
My mother stood at the gate and looked after us as we walked toward the railway station．我妈妈站在大门口，目送着我们向火车站走去。
look after . pay attention to；concern oneself with 对…关注；为…操心
He knows how to look after his own interests．他知道如何照顾到他自己的利益。
Don't look after your own interests to the exclusion of those of others．不要只顾自己的利益而不顾别人的利益。
look ahead . think of and prepare for future needs考虑到将来；展望未来；预料
We must look ahead before we go further in the matter．在进一步进行这件事情之前，我们必须考虑得远一些。
We are looking ahead to a prosperous future．我们预料将会有一个繁荣昌盛的未来。
look at . watch 看
Father always looks at me with love in his eyes．父亲总带着慈祥的眼光看着我。
Everybody looked at the hero with great admiration．大家都以钦佩的目光注视这位英雄。
look at . have a way of thinking or feeling toward； think about something in a certain way； consider对…持某种看法或感觉；考虑
Is he a hero or a villain? That depends on how you look at it ．他是英雄还是恶魔? 决于你如何看待他了。
We should look at problems from different aspects，not from just one．看问题要从各个方面去看，不能只从单方面看。
What he looks at is its economy．他是从经济的角度看问题的。
look at . judge by the outward appearance从表面看来；从外观来看
To look at her， you'd never guess that she is a university professor．从外表看，你决不会猜到她是一位大学教授。
The building is not much to look at．这幢房子的式样不怎么好看。
look at . examine；inspect检查；察看；调查
You'd better have your ankle looked at by the doctor．你最好让医生检查一下你的踝骨。
Have you asked the plumber to come and look at the leaking pipe? 你叫管道工来检查过漏水的管子了吗?
We must look at all the facts．我们必须调查所有事实。
look at . consider or accept（a proposal，suggestion， offer，）考虑或接受（建议、提供等）（通常用否定式）
I wouldn't look at a job like that．我不愿接受那样的工作。
After the way he treated her， she wouldn't look at another man．她领略了他对待她的方式以后，就不愿再和任何男人打交道了。
look back . review the past ； think of what has happened回顾过去；回想
If we look back， we will realize the tremendous changes reform has made．回顾过去，我们就会发现改革带来的巨大变化。
He looked back with remorse on the serious mistakes he had made．他回顾自己所犯的严重错误，深感悔恨。
As John looked back，his life seemed good to him．约翰回顾过去的生活时，他觉得过得不错。
look back . show signs of retrogression or interrupted progress后退；停止不前；畏缩
Don't look back； you will succeed．不要畏缩，你一定会成功的。
look black . look angry面现怒容
He looked black at his enemy．他怒视敌人。
look black . appear threatening；indicate misfortune（形势等）看上去严峻；呈现危机
The future looked black when father got hurt and could not work．父亲受了伤不能去上班，前景很严峻。
As prices dropped lower and lower，things looked black for Henry's company．价格一再下跌，亨利的公司面临了危机。
look blank . appear astonished，confused or perplexed吃惊；茫然不知所措
He looked blank when he was informed of his dismissal．听说他被解雇时，他茫然不知所措。
look blue . look unhappy；look disheartened or dejected愁眉不展；沮丧
She looks blue all day．她整日愁眉不展。
The banker looked blue when he read of the decline in stocks．那位银行家读到股票下跌的新闻时，神情十分沮丧。
You are looking blue， what's the matter? 你愁眉苦脸，出了什么事啦?
look blue . have no hope无希望
Things look blue．事情没有希望了