keep out . hinder from entering 阻止入内

The children have been warned to keep out of the fields while the crops are growing．已经告诫孩子们不要在庄稼生长的时候走进庄稼地。

They have shut the door，and mean to keep us out．他们已经把门关起来，意思是不准我们进去。

Don't keep him out in the cold；ask him to come in．别让他大冷天站在外面，请他进来。

The sign on the door said：“Danger！Keep out！”门上的牌子写着“危险！切勿入内！”

keep out . withhold；reserve ；save 留出；保留

The best cuts of the meat were kept out for the sick and wounded．最好的几刀肉留给了伤病员。

keep out . keep from falling into （danger）；avoid 避免

The number of deaths might be much smaller if we taught little children how to keep out of danger．如果我们教育小孩怎样避免危险的话，死亡的数目可能会减少很多。

keep out of . not become involved in；stay away from something bad不参与进去；不介入某事；不要惹事

I warned Bill to keep out of these things，but he wouldn't listen．我告诫过比尔不要参与这些事情，但是他不听。

Keep out of what doesn't concern you．别参与跟你无关的事。

I hope you'll keep out of trouble while I'm away．我不在家时，希望你不要惹事。

keep pace with . maintain the same rate or speed as；not get behind与…并驾齐驱；不落后

I can't keep pace with her in mathematics．在数学上我比不过她。

We must keep pace with the times．我们必须跟上时代的步伐。

When we go for a walk，John has to take long steps to keep pace with us．当我们出去散步时，约翰必须迈大步才能跟上我们。

His mental development kept pace with the growth of his body．他的智力发展和他的体格发育齐头并进。

keep quiet . remain silent 安静

The doctor ordered the patient to keep quiet a few days．医生命令那位病人静养几天。

keep quiet . keep secret 保守秘密

If I tell you the story，will you promise to keep it quiet? 假如我把这件事告诉你，你会保守秘密吗?

keep to . stick to；adhere to；abide by 固守；遵守；坚持

He always keeps to his promises．他总是坚守诺言。

He still keeps to his first resolution．他仍坚持他最初的决定。

It is necessary for us to keep to the style of hard struggle and plain living．我们很有必要保持艰苦朴素的作风。

Whatever your argument， I shall keep to my decision．不管你怎么争辩，我都将坚持我自己的决定。

keep to . stay in 呆在某处

He has decided to keep to his bed．他决定躺在床上。

When he is in a bad temper，he always keeps to her room all day．当他脾气不好时，就整天闷在自己的房间里。

The weather is so terrible that most people are forced to keep to the house．天气太糟糕了，大多数人都被迫呆在家里。

keep to . bear towards 靠向

When driving we keep to the right and overtake on the left．驾驶汽车时，我们靠右边走，超越前面的车时，应当从左边走。

In China，traffic keeps to the right．在中国，车辆是靠右行驶的。

keep to . not deviate from；limit oneself to 使不偏离；限制在（某话题、某范围内）

Let's keep to the subject since we don't have much time．我们不要离题，因为我们没有太多时间了。

keep to oneself . live apart 避免交际；独居

He keeps to himself most of the time．他大部分时间独居自处。

keep to oneself . remain private 不给人知道；保守秘密

Don't keep the news to yourself；let's all share it ．不要只管自己知道这消息，让我们也知道吧。

I'll tell you only if you promise to keep it to yourself．你答应保守秘密，我才告诉你。

I can't understand why you kept the news to yourself for so long．我不明白你为什么这么长时间也不把消息告诉他人。

keep track of . maintain a record of记载

We have to keep track of every cent we spend．我们必须记下用去的每一分钱。

keep track of . follow the progress or course of；keep informed about注意…进展或发展过程；掌握…线索

He reads the newspapers to keep track of current events．他看报以便了解时事。

Mr．Stevens kept track of his business by telephone when he was in the hospital．史蒂文斯先生在住院期间通过电话了解他的生意情况。

The drug squad successfully kept track of the suspected smugglers and arrested them all in one night．那个毒品缉私队成功地掌握了那些走私嫌疑犯的线索，并在一个晚上将他们全部逮捕。

keep under . suppress 控制；压制

The old man kept his feelings under for too long．老人长期以来抑制住自己的感情。

The firemen battled against the flames for several hours before keeping them under．消防队员跟大火搏斗了几个小时才把火势控制住。

keep under . hold in subjection；repress；hold back使处于被统治地位；征服；约束

Kept under for several centuries，the people of this country finally achieved independence．这个国家的人民受奴役压迫了几个世纪，最后终于获得了独立。

You won't keep her under for much longer．你约束不了她多久了。

keep under . maintain in a state of unconsciousness or strong sedation处于昏迷或强镇静麻醉状态

The poor man's pain was so intense that he was kept under by means of regular injections of morphine．那个可怜的老人疼得非常厉害，要用打吗啡针的办法才能使他镇静下来。

Throughout the operation，he was kept under by acupuncture anaesthesia．他在开刀时，一直是用针灸麻醉的。

keep under . keep observing；maintain a constant watch持续观察；密切监视

The plainclothes officers were told to keep the suspected man under constant observation．便衣警察受命密切监视那个有嫌疑的人。