Two analogies come to mind when I think about Groupon and LivingSocial: "churn and burn" and "pump and dump."

当我想到Groupon和LivingSocial时，两个类比形式出现在我的脑海，流失和灼伤；打气和泄气。

youdao

The absence of any of these four factors should be a red flag that the so-called report could really be a pump and dump marketing ploy.

这四个因素少了哪一项都应该是危险信号：所谓的研究报告可能真的是一个拉高出货的市场计谋。

youdao

Thee lump jumped off the pump and bumped on the trumpet in the dump.

傻大个跳下水泵撞到垃圾堆里的喇叭上。 。

youdao

Mr Blair's message came ahead of a nationwide petrol boycott of garages - "Dump the Pump" - planned for 1 August, which has attracted a huge amount of support via the Internet.

BBC: Motorists hit by petrol 'rip-off'

One theory is that it was part of a pump and dump stock operation.

FORBES: The Great Google Takeover Fake Press Release

One pump and dump scheme revolving GTX Global involved tens of millions of dollars, said Mr Turner.

BBC: 'Pump and Dump' conmen targeted