pro quo. You scratch my back, I scratch yours.
3. Quid pro quo
拉丁文，意思是"An equal exchange or substitution, one thing for another; something
for something公平交易"，例如：I think it should be quid pro quo--you mow the lawn and
I'll take you to the movies.
4. Scratch someone's back
意思是"Do someone a favor in hopes that a favor will
be returned"，例如：I don't mind driving this time--she's scratched my back plenty
口语中常用到的表达是You scratch my back and I'll scratch yours. 例如：If you do the
laundry I'll do the cooking--you scratch my back and I'll scratch yours.
5. In deep
"卷入很深无法摆脱"，通常指商业上的投资，例如：He was in deep with the other merchants and couldn't
strike out on his own.
此处的意思类似于 in deep water（卷入麻烦很深），例如：The business was in deep water after the
United States Federal Witness
Protection Program 美国司法中的证人保护
In the United States, the Witness Protection Program (also known as the
Witness Security Program, or WITSEC) is established by the Organized Crime
Control Act of 1970, which in turn sets out the manner in which the U.S.
Attorney General may provide for the relocation and protection of a witness or
potential witness of the federal government, or for a state government in an
official proceeding concerning organized crime or other serious offenses.
Witness protection is the process in which witnesses, such as those who
testify in criminal trials, are protected against intimidation before their
testimony or criminal retaliation after. The U.S. Federal Government both
relocates and gives new identities to witnesses who risk their lives by giving
testimony as well as providing financial and employment aid. To help avoid
discovery, witnesses are expected to sever all ties with former acquaintances.
According to the agency, "No program participant following security guidelines
has ever been harmed while under the active protection of the Marshals Service";
conversely, nearly all of the witnesses who were harmed had either failed to
fully comply, often at times contacting old acquaintances, or had already left
The Federal Government also gives grants to the states to enable them to
provide the same program. The federal program is called WITSEC (the Federal
Witness Protection Program) and was founded in the late 1960s by Gerald Shur
when he was in the Organized Crime and Racketeering Section of the United States
Department of Justice. Most witnesses are protected by the U.S. Marshals
Service, while protection of incarcerated witnesses is the duty of the Federal
Bureau of Prisons.