问个英语的问题 blackmail 和 extortion 有什么区别：
blackmail /ˈblækˌmeɪl/ CET6+ TEM8 ( blackmailing, blackmailed, blackmails )
N-UNCOUNT Blackmail is the action of threatening to reveal a secret about someone, unless they do something you tell them to do, such as giving you money. 敲诈
It looks like the pictures were being used for blackmail.
N-UNCOUNT If you describe an action as emotional or moral blackmail, you disapprove of it because someone is using a person's emotions or moral values to persuade them to do something against their will. 要挟 [表不满]
The tactics employed can range from overt bullying to subtle emotional blackmail.
V-T If one person blackmails another person, they use blackmail against them. 敲诈
He told her their affair would have to stop, because Jack Smith was blackmailing him.
The government insisted that it would not be blackmailed by violence.
N-UNCOUNT Extortion is the crime of obtaining something from someone, especially money, by using force or threats. 勒索
He has been charged with extortion and abusing his powers.
2) person (or a group of people) engaged in corruption/extortion
3) machine that consumes a great deal of energy
把它比做纸老虎liken it to a paper tiger
逃出来的老虎被捕获后，大家都松了一口气。With the capture of the escaped tiger， everyone felt relieved.
活老虎a live tiger
像老虎钳一样夹紧某物get a vice-like grip on sth.
老虎向山羊扑去。The tiger sprang on the goat.
孩子们把他比做老虎。The children compare her to a tiger.
老虎来了，小动物要遭殃了。The tiger has come and the small animals are going to be killed off.
Foreigners like to come to the evening 24 hours convenience store shopping, because they are not afraid of extortion。
let is go 什么意思？？：
1. Television is no fun; let's go to a concert.
2. Playing (at) chess is no fun; let's go to play table tennis.
3. Let's go home together after class (is over).
4. The time is up. Let's go quickly.
5. When my children say they will leave me in peace if I let them go to the pictures,it is little short of extortion.