And the answer,she says, is that bilingual people are often better at controlling their attention -- a function called the executive control system.

VOA: special.2011.03.09

And that group did much better on the learning task than the control group, because they were put into a positive mood.

第二组,在学习任务上比对照组表现更好，因为他们被置于积极情绪。

哈佛公开课 - 幸福课课程节选