This is not a subject that many media programs have tried to explain to very small children.

VOA: special.2009.11.27

I tried to explain, but I got in a fight.

我尝试去解释，但是我还打架了。

普林斯顿公开课 - 人性课程节选

He said he tried to explain what children generally are like at different times in their development so parents would know what to expect.

VOA: special.2009.03.15

So they have tried to explain their findings on a Harvard Web site.

VOA: special.2010.02.03