roll about   .  （a spectator，a listener，） enjoy oneself or laugh hilariously（观众、听者等）欢笑；笑得前俯后仰；捧腹大笑

The audience were rolling about in their seats as the clown roped around on the stage．小丑在台上蹦来跳去，逗得观众在座位上捧腹大笑。

 roll back . reduce（the price of a commodity）to a former level 使（物价等）全面回落；降到原有水平

Drastic measures have been taken to roll back commodity prices．已采取有力措施全面回落物价。

roll back . repel；cause to fall back击退

We were confident that we could roll back the enemy forces that barred our way．我们深信能击退堵击我们的敌军。

The new administration is confident of rolling back the tide of unrest which is sweeping the country．新政府自信能击退这股席卷全国的动乱浪潮。

roll back . （a time in the past） return steadily to somebody 's consciousness回到某人记忆中；渐渐回忆起过去某一段时间的事情

As the grandmother spoke，the years rolled back and she saw herself as a small girl again．当祖母讲话时，过去的岁月逐渐回到记忆中来，她仿佛看到自己又是一个小孩子了。

roll in .  come in great volume or quantity 滚滚而来；大量涌进

Good news keeps rolling in from our scientific and technological fronts．我国科技战线上捷报频传。

Offers of help are rolling in．大量的援助滚滚而来。

roll in .  luxuriate in；abound in；have a good deal of（money，）沉溺于；富于

He's rolling in money，since he's inherited his rich father 's fortune．由于继承了富有的父亲的遗产，他成了腰缠万贯的富翁。

roll in .  go to bed就寝

The old professor rolled in late every night．这位老教授每天很晚才睡觉。

roll off   .  print or duplicate by passing paper through the rollers of a machine通过（机器）印出；复制出

You can quickly roll off a few copies of the exercise on the duplicating machine．你可以在复印机上很快地把这个练习复印几份。

roll out . make flat and smooth by pressing with a roller，or rolling pin碾平；擀平

She rolled out the dough in order to make a few pies．她把面团压平做了几个馅饼。

roll out . come forth copiously；make a deep and sonorous sound 滔滔不绝地说出；洪亮地讲出或唱出

The actor rolled out his words so that everyone in the theatre could hear．那位演员声音洪亮地朗诵台词，以使剧场里的每一个人都能听到。

She rolled out these verses emotionally．她充满激情地朗诵这些诗句。

roll out the red carpet . welcome with ceremony 正式欢迎

They rolled out the red carpet for the visiting president and his party．他们隆重欢迎前来访问的总统一行。

roll out the red carpet . greet with great respect and honor ；give a hearty welcome热烈接待；恭敬地迎接

Jerry 's family rolled out the red carpet for his teacher when he called．杰里的老师来家访时，全家人都热情地欢迎他。

 roll up . wrap up 包起来

He rolled himself up in a blanket．他用毯子把自己裹了起来。

 roll up . accumulate；collect；increase积累；增加

Thrift and diligence make him roll up a fortune．勤俭使他积累了很大一笔钱财。

His debts rolled up as he couldn't pay them in time．他无力及时还清债务，因此债台越垒越高。

 roll up . arrive， appear on the scene ；come up in large numbers ；arrive in a vehicle 到场；出现；涌来；乘车到达

The whole family rolled up to their daughter 's first appearance on the stage．全家人都到场观看他们的女儿初次登台演出。

The visitors rolled up to the hotel at eight sharp．参观者八点整到达旅馆。

Just when we had given up all hope of their coming，they rolled up in a taxi．正当我们放弃了希望，以为他们不会来时，他们却乘坐出租车到了。

 roll up . make into or form a roll卷起

He rolled up his sleeves and set to work at once．他卷起袖子，立即开始工作。

He rolled up his umbrella．他收起了伞。

root about . root around  .   search about 到处搜查

He rooted around for his notebook．他到处寻找他的笔记本。

She has been rooting about for her lost daughter．她一直在寻找她失踪的女儿。

root out . remove by the roots连根拔除

We rooted out the weeds in our garden．我们清除园子里的草。

root out .  destroy completely肃清；灭绝

We must root out this evil．我们要根除这种弊病。

It is necessary to root out corruption in government．有必要根除政府的腐败行为。

root out . discover and bring to light翻出；找出

Julie rooted out some reference books from the library．朱丽从 图书馆里找了一些参考书。

Can you root out some good players for the team? 你能为队里物色几个优秀选手吗?

rope in . rope into . use a trick to make somebody  do something ；deceive；fool 欺骗

The swindler had roped in a number of gullible persons．这骗子已经骗了许多轻信的人。

rope in . rope into .  get somebody  to join or help； persuade to do something 使（某人）参加；劝（某人）做某事

I didn't want the job of selling tickets for the dance， but I was roped in because everyone else was too busy to do it ．我不想做卖舞会门票的事，可是我被拉来了，因为别人都太忙了。

rough in . rough out  .  get out something  in a rough form 草拟；画出…轮廓

I've roughed out the direction that we should take．我粗略地画出了我们应该走的方向。

The architect roughed in some trees and flowers to give some idea of how the area would look when the building was finished．建筑师在草图上画了些花草树木，让人们了解该地区建设好以后将是个什么样子。

rough it . live like primitive people ；live with little comfort and equipment 过原始生活；过野外生活

We're going to rough it on this trip．We bought a tent，and we're going to cook all our meals over a campfire．这次旅行我们要过艰苦的生活。我们买了一顶帐篷，打算每餐饭都用营火做。

For almost half a year，these geologists lived in the mountains，roughing it in their tents．这几位地质学家在山里住了几乎有半年，他们以帐篷为家，过着艰苦的生活。