suffer from . have pain or bad health because of 患（病）

He always suffers from stomach trouble．他经常胃痛。

 suffer from . be troubled by因…受困扰

She suffers from poverty．他为贫困所扰。

sum up . express briefly the chief points of what has been said 总结；归纳

Please sum up the main points of the text in three sentences．请用三句话总结这篇课文的主要观点。

To sum up，for the reasons I have just given，I think my plan is better．从我刚才所述的理由综合起来看，我认为我的计划比较好。

The judge summed up for twenty minutes．法官作了二十分钟的概述。

sum up . form a judgement or opinion of 判断

He could sum up situations at a glance．他只要看一眼就能对形势作出判断。

When he walked in，I quickly summed him up．他走进来时，我很快就对他有所品评。

summon up . gather the necessary courage，strength to do something 鼓起

He had to summon up all his courage before he dared enter the room．他得鼓起勇气才敢进房间。

He found it impossible to summon up enough strength to finish the marathon．他觉得要鼓起力量跑完马拉松是不可能的。

superior to . better than 比…好

This article is superior to that one in style．这篇文章在文体上要比那篇好。

This watch is superior to that one．这块手表比那块好。

superior to . strong enough in character 不屈服于

Always modest and prudent，he is superior to flattery．他总是谦虚谨慎，从来不为谄媚所动。

superior to . excelling 胜过；超过

In playing football，Tom is superior to Smith．在足球方面，汤姆要比史密斯强。

supply with . provide with 提供

The government has promised to supply the farms with power next year．政府答应明年给农场供电。

They supplied the whole brigade with all the bedding and towels they needed．他们向全旅人员提供了他们所需要的被褥和毛巾。

supposed to . obliged to应该

She is supposed to come by this time．她这时该到了。

at the present moment he is supposed to be in town．估计现在他是在城里。

sure of . certain of确信；深信

I am sure of success．我相信能成功。

swallow up . take in；use up 吞没；耗尽

The aircraft was swallowed up in the clouds．飞机没入云海中。

The sea waves eventually swallowed up the tiny craft．海浪终于吞没了那条小船。

His expenses swallowed up all his earnings．他的费用耗尽了他的所有收入。

swear at . curse咒骂

Mind your language！Don't swear at him．说话要小心，不要恶语伤人。

He resented being sworn at．他憎恨别人骂他。

swear by . praise or recommend极力推荐；极其信赖

She swears by aspirin as the best remedy for a headache．她极力推荐阿斯匹林治头痛。

I always swear by their products．我一贯信赖他们的产品。

swear in . make somebody take an oath to be truthful，loyal，obedient，宣誓就职

The new president was sworn in last week．新总统上星期宣誓就职。

He was sworn in shortly after the election．选举后不久他就宣誓就职了。

swear off . vow to abstain from 发誓不再；发誓戒掉

He finally made up his mind to swear off smoking．最后他决心戒烟。

Since his illness，he has sworn off drinking．生病以后，他已发誓戒酒。

swear to . assert with great conviction 断言；发誓肯定

I can't swear to it，but I don't think he would lie to me．我不敢断言，但我认为他不会对我撒谎的。

I was sure I locked the door when I left the room，but I can't really swear to it ．我离开房间时肯定是锁了门的，但我不能把话说死。

 sweat out . get rid of an illness by sweating 出一身汗以去掉

When you feel flu coming on，get into bed and sweat it out．当你觉得开始有点感冒时，赶快上床去睡，出身汗就好了。

 sweat out . bear；endure until the end 忍受；坚持

They'll just have to sweat it out until help comes．他们只好坚持下去，直到有人前来帮助。

swing round . turn round quickly 猛转身

He swung round to see who had pushed him．他赶紧回头看谁推了他。

He swung round to confront the man who had been shadowing him．他急忙转过身子，正视着尾随他的那个家伙。

swing round . change（opinion）改变（观点等）

When he realized the truth of the situation，he completely swung round to our position．他了解到事情真相后，就完全转到我们这方面来了。

switch on . switch off . turn on . turn off . 开关

Please switch the light on；it,is,getting dark．天黑了，请开灯。

switch to . shift；change转变；改变

As he didn't like that radio play，he switched to another programme．因他不喜欢那个电台节目，就换了另一个节目。