keep a straight face . keep from smiling or laughing 不露笑容

He kept a straight face while he was telling his story．他板着面孔讲述他的故事。

The situation was so humorous that I found it difficult to keep a straight face．场面如此滑稽，我很难不发笑。

keep about . keep around . have something always present 随手可得

I like to keep a few envelopes about in case I need them．我喜欢手头有些信封，以备万一要用。

Not many people nowadays keep servants about the house．当今雇用仆人长住家中的人不多。

keep about . keep around . go on with one's duties 继续履行职责

She is very ill，but she still keeps about．她病很重，但仍然继续工作。

keep after . continue chasing 不停地追赶

The police kept after the criminal until at last they caught him．警察不停地追赶犯人，直到最后逮住了他。

Our PLA detachment kept after the fleeing bandits for a long time before they caught them．我解放军小分队跟踪追击那批逃窜的匪徒，好长一段时间才把他们抓住。

keep after . speak to somebody about something again and again；remind over and over again 重复谈及；一再提醒

Some pupils will do sloppy work unless the teacher keeps after them to write neatly．有些学生作业马虎草率，除非老师一再提醒他们要书写整齐。

If you want to get any essays out of those lazybones，they have to be kept after．你要想让那些懒鬼写文章的话，就得反复催促他们不可。

keep after . find fault with 找毛病

She keeps after the children the whole time．她一直在找孩子们的差错。

Don't keep after the nurses all day long or they'll all resign．不要整天钉住保育员们找毛病，否则他们都要辞职。

keep an eye on . watch in order to take care of 照料

Please keep an eye on my house when I am out on holiday．我外出度假时，请照料一下我的房子。

Please keep an eye on my child while I'm away．我不在时，请你帮我照看一下孩子。

keep an eye on . have an eye on；watch carefully；not stop paying attention to 谨慎注意；不停地注意

We should always keep an eye on the progress of science in the world．我们应密切注意世界上的科学发展。

Keep an eye on the time so you won't be late．注意看看时间，不要迟到了。

We have to keep an eye on the opportunities for business．我们必须注意做生意的机会。

A good driver keeps his eye on the road．好的驾驶员会注意看路。

keep an eye on .  guard 看守；密切注视；警戒

That man looks suspicious；keep an eye on him．那人形迹可疑，注意他。

The bank guard kept an eye on the parking lot while they were loading the armored truck with money．在给装甲车上装钱时，银行的卫兵密切注视着停车场。

keep an eye out for . be on the alert for；be vigilant；watch for 警戒；密切注意

The police have been instructed to keep an eye out for pickpockets at the fair．警察奉命监视博览会里的扒手。

Keep an eye out for future announcements．注意以后的通知。

keep at . continue to do；go on with；persist with 持续；继续；坚持做

He kept at the job till it was finished．他把这个工作坚持做完。

They kept at it，until they succeeded in their experiment．他们坚持不懈，直到试验成功。

He kept at me for payment．他坚持要我付款。

You must keep at your studies．你不要放弃你的学业。

keep at .  worry with repeated requests，complaints，以不断地请求、抱怨等纠缠或困扰（某人）

They kept at the film star with their appeals for subscriptions．他们缠着那位影星，请求签名。

The children kept at their mother to take them to the movies，and she had to agree in the end．孩子们缠着妈妈带他们去看电影，最后她只好答应了。

keep at arm's length . keep at a distance 保持一段距离

You had better keep him at arm's length．你最好不要和他过分亲近。

 keep away . remain a distance from；prevent somebody from coming or going near；avoid coming 不要接近；阻止某人干某事

Nothing will keep me away from the exciting play．什么也无法阻止我去看那出令人激动的戏。

Keep away from the fire．不要靠近那火。

You'd better keep away from the dog．你最好不要靠近那条狗。

Keep the child away from the water's edge．不要让孩子靠近河边。

What kept you away yesterday?  昨天你为什么没有来?

 keep away .  abstain 戒

He keeps away from liquor and tobacco．他不吸烟，也不喝酒。

 keep back . prevent from coming阻止

Police horses were used to keep back the crowd．警马被用来阻挡人群。

Dykes keep back the floodwater．堤坎拦住洪水。

The police tried in vain to keep back the protesting crowds who were rushing towards the government building．警察企图挡住冲向政府大厦的抗议人群，但未能成功。

 keep back . control；hold back 控制

Jim was able to keep back his anger and avoid a fight．吉姆能抑制住自己的愤怒，从而避免了一场殴斗。

In vain I tried to keep back my tears．我怎么也忍不住我的眼泪。