fly high . feel very happy；feel joyful心神荡漾；心花怒放

Jack was flying high after his team won the game．杰克的球队获胜后，他高兴得不得了。

He was flying high when this reversal occurred， and now he's in low spirits again． 正当他情绪高昂时，受到了挫折，现在他又灰心丧气了。

fly into . suddenly develop or exhibit突然出现

He flew into a rage when he heard the news．他听到这一消息很生气。

Don't fly into a temper with me ！别跟我发脾气！

The students in Class Two flew into raptures when their team won the game．二班的球队获胜时，全班学生欣喜若狂。

fly out . rush out suddenly冲出

A cry of “Fire” was raised and all the people flew out of the house． 失火的叫喊声一起，所有的人都冲出室外。

As I was passing the gate， a dog flew out at me．当我走过大门口时，一只狗向我冲来。

The children flew out to see the parade．孩子们奔出去看游行队伍。

fly out . burst into a passion发怒

I tried to calm him down when he flew out at me．他对我大发脾气时，我设法使他平静下来。

Don't fly out into a rage．不要发脾气。

fly out .go out in an aircraft； carry out in an aircraft乘飞机外出；用飞机把…运走

The commander flew out to join his troops at the front．指挥官乘飞机到前线部队去。

The injured in the earthquakes thicken area were quickly flown out for medical treatment．地震灾区的伤员们被迅速空运出去进行治疗。

fob off . get something false or inferior accepted as good or real； trick or deceive somebody  into buying or accepting以假货或次货骗人；欺骗某人购买或接受

Actually the foreign stamps displayed in the window were of very little value， but he had found that they could be fobbed off upon children．说实在的，橱窗里展出的外国邮票并没有什么价值，但他发现那些邮票却可以拿来哄骗小孩。

The peddler fobbed off pieces of glass as diamonds．这小贩鱼目混珠，以玻璃充当钻石骗人。

fob off . put aside ； not really answer but get rid of丢在一边；置之不理

Her little brother asked where she was going， but she fobbed him off with an excuse．她弟弟问她去哪里，但她却借故不答。

fob off . put somebody off by deception or trickery用欺骗、诡计打发某人；搪塞某人

He tried to fob us off with the excuse that he had been ill， and so had overlooked the matter．他企图以病为借口欺骗我们，说因为生病才忽略了这件事。

When the creditors demanded their money， they were fobbed off with a promise to pay them when he received his rents at the end of the month．当债主们来索钱时，他以月底拿到租钱就付款的谎言搪塞他们。

focus on . aim（light） directly onto把（光）在…上聚成焦点

If you focus bright sunlight on dry wood with a magnifying glass，it will start burning ．用放大镜把强阳光聚焦到干柴上，干柴就会燃烧起来。

focus on . direct one's thoughts firmly on 思想集中到…上

We must focus our attention the question of reducing costs．我们必须把注意力集中到降低成本这个问题上。

The audience focused its attention on the speaker．听众把注意力都集中在演讲者身上。

She focused her mind on her lessons．她把她的心思都集中在学习上。

focus on . have as its main point of interest重点是；中心是

This year our meeting focuses on the question of children's rights．今年，我们的会议中心议题是儿童的权益。

fold up . end in failure ；go bankrupt ；close up以失败而告终；破产；倒闭；停止营业

The business folded up．买卖失败了。

In an economic crisis， smaller enterprises are usually among the first to fold up．小的企业在经济危机中往往最先倒闭。

Most of his ambitious schemes folded up on him．他的野心勃勃的计划大部分都玻产了。

The new restaurant folded up in less than a year．这家新开的饭馆不到一年就关门了。

fold up . suffer moral or spiritual collapse 垮掉；精神崩溃

She didn't fold up when her only son died． She kept on working even harder．当她的独生子死去时，她并没有精神崩溃，相反更加努力地继续工作。

He folded up when the prosecutor discredited his story．当检察官不相信他的陈述时，他精神崩溃了。

fold up . collapse with mirth or pain（因高兴或疼痛）坍下来（笑得要命，痛得要命等）

From the moment the clown appeared on stage，the audience folded up in their seats．这个小丑一上场，观众们就坐在椅子上笑得前俯后仰。

The pain in her stomach was so sharp that she folded up．她的胃疼得她连腰都直不起来了。

He folded up with laughter．他笑弯了腰。

fold up . make smaller by folding叠小

She folded up the papers．她叠起了报纸。

Fold up your clothes tidily，please．请把你的衣服叠整齐。

Would you fold up the garden chairs and put them in the storeroom？你能把花房里的折叠椅叠起来放入储藏室去吗？

fold up . collapse ；break down坍塌；倒塌

He sat down on the chair， but it suddenly folded up under him．他往椅子上一坐，但是突然那椅倒塌下来了。

The table folded up under the heavy weight．这张桌子因上面放的东西太重而倒塌了。