Mr.Netanyahu also warned that the Islamic militant group Hamas could seize control of a Palestinian state in the West Bank, just as it ousted Mr.Abbas from the Gaza Strip in 2007.

VOA: standard.2009.04.17

there were 250 kids who got nothing, who were also studied, 250 kids in the control group.

有另外250个孩子，他们什么也没得到，也列为了研究对象，250名对照组的孩子。

哈佛公开课 - 幸福课课程节选

The control group that joined no intervention actually were more luckily to advance in their workplace 20, 30 years later.

未参与干预的对照组,更有可能在二三十年后获得升职。

哈佛公开课 - 幸福课课程节选

What happens in many poor neighborhoods is that a small group takes control of the water kiosk or communal tank and sets its own tariffs for the water it sells by container.

VOA: standard.2010.08.04

But also, the students put in actually more time into the class and they outperformed the control group.

而且学生对课业,付出更多时间，成绩比对照组好。

哈佛公开课 - 幸福课课程节选