President Pierce found it difficult to control them.

VOA: special.2009.04.16

One group of children was a control group; the second group was taught to think back to experience that make them laugh or smile.

一群小孩组成对照组;,有人教第二组小孩回想,让他们大笑或微笑的经历。

哈佛公开课 - 幸福课课程节选

He wanted to make sure parents knew they should have control over their children and expect cooperation from them.

VOA: special.2009.03.15

answered Aylmer,surprised. The mind is in a sad state when sleep cannot control its ghosts and allows them to break free with their secrets.

VOA: special.2009.09.26

Some of them - especially Henry Clay and Daniel Webster - believed they could continue to control him, even after Harrison moved into the White House.

VOA: special.2009.01.22

And that's half the battle with education. Give them control, make them feel confident and enjoy their learning and you'll see them start to improve and embrace it."

VOA: special.2011.04.21

The United States Centers for Disease Control had sent them to help.

VOA: special.2009.02.23

Now,many leaders agree it is time for them to start backing off from stimulus spending, and get their debts and deficits under control.

VOA: standard.2010.06.05

If someone is detained because they appear ill, a medical expert from the Centers for Disease Control and Prevention comes to the scene to check them and, if necessary, send them back over the border.

VOA: standard.2009.04.30