concerns what's called "conservation."

就是"守恒"
The notion of conservation is that there's ways to transform things

守恒是指物体某方面的特征
such that some aspects of them change

不会因为其他方面特征的改变
but others remain the same.

而有所改变
So, for instance, if you take a glass of water

比如说你有一杯水
and you pour it into another glass that's shallow or tall,

将水倒进另一个更浅或者更深的杯子里
it won't change the amount of water you have.

含水量并未发生任何改变
If you take a bunch of pennies and you spread them out,

如果你把一卷硬币全部摊开
you don't get more pennies.

你不会得到更多的硬币
But kids, according to Piaget,don't know that

但皮亚杰认为儿童并不知道会这样
and this is one of the real cool demonstrations.

这个概念是非常精彩的证据之一
Any of you who have access to a four- or five-year-old,

如果你身边有四五岁大的孩子