1.at once是立刻的意思吗？
2.back on什末意思？
3.flown什末意思？
3要求：意思，音标，和词性。
谢谢啦！
參考答案:at once: [ ət 'wʌns ]
立刻,马上
例句与用法:
1. He stopped playing the piano at once.
他立刻停止了弹钢琴。
2. If you see anything suspicious, inform the police at once.
你要是看到什么可疑的东西就马上通知警察。
3. When I gave him the chance, he grabbed it at once.
我给他这一机会，他立刻抓住不放。
4. It is necessary that he be sent there at once.
有必要马上派他到那里去。
5. We determined to go to the railway station at once.
我们决定立刻去火车站。
6. Since she is seriously ill, we have to send for a doctor at once.
既然她病得厉害, 我们要马上去请医生。
7. We agreed to leave at once.
我们同意立即离开。
8. The man was so genial, so I was drawn to him at once.
这人这么和蔼, 我立刻为他着迷。
英英解释:
副词at once:
1. without delay or hesitation; with no time intervening
同义词：immediately, instantly, straightaway, straight off, directly, now, right away, forthwith, in real time, like a shot
2. simultaneously
同义词：at a time, at one time
back on:
背靠
例句与用法:
1. The company goes back on its agreement to supply at1.50 a unit.
该公司违背了按单价1。50英镑供货的协议。
2. Can you lend me$10 and I'll pay you back on Friday?
你能借给我10美元吗？我星期五还你。
3. She reacted to the insult by turning her back on him.
她受辱之后就不再理睬他了。
4. He slapped me on the back on my way home.
在我回家的路上，他在我背上拍了一下。
5. Put the book back on the shelf when you've finished it.
书读完后，要放回原处。
6. He soldered the wire back on.
他把金属丝重新焊上去了。
7. He turned his back on me and I knew that he was angry with my words.
他背过身去不理我, 我知道他肯定是被我的话惹恼了。
8. I can't just turn my back on him now that he's ill and poor.
我不能因为他贫病交迫而背弃他。
flown: [ fləun ]
fly的过去分词
例句与用法:
1. Five thousand people were flown to Paris during the Easter weekend.
在复活节的周末有五千人乘飞机去巴黎。
2. He had flowers specially flown in forthe ceremony.
他特地为这一典礼空运来了鲜花.
3. Are the goods to be flown or shipped?
这些货物是空运还是海运?
4. The robbers have flown (the country).
抢劫犯逃到国外去了.
5. `Have you ever flown a helicopter?' `No, never.'
‘你坐过直升飞机吗?’‘没有, 从未坐过.’
6. Summer has just flown (by).
夏天一晃就过去了.
7. Medical supplies are being flown in under the aegis of the Red Cross.
在红十字会的保护下, 正在空运进医药用品.
8. With the failure of the peace talks all hopes of a swift end to the war have flown out of the window.
和谈失败后, 迅速结束战争的希望都已化为乌有.
英英解释:
动词fly:
1. travel through the air; be airborne
同义词：fly, wing
2. move quickly or suddenly
同义词：fly
3. fly a plane
同义词：fly, aviate, pilot
4. transport by aeroplane
同义词：fly
5. cause to fly or float
同义词：fly
6. be dispersed or disseminated
同义词：fly
7. change quickly from one emotional state to another
同义词：fly
8. pass away rapidly
同义词：fly, fell, vanish
9. travel in an airplane
同义词：fly
10. display in the air or cause to float
同义词：fly
11. run away quickly
同义词：flee, fly, take flight
12. travel over (an area of land or sea) in an aircraft
同义词：fly
13. hit a fly
同义词：fly
14. decrease rapidly and disappear
同义词：vanish, fly, vaporize
