One famous experiment in the 1960s involved 3- to 6-year-old children.
20世纪60年代，在3到6岁的儿童中开展了一项著名实验。
It could be concluded that 6-year-old children possess a separate naive theory of biology in terms of aging.
由研究结果可以推论，6岁儿童在衰老维度上具有了较稳定的朴素生物理论。
A new study has found that most three-year-old children can remember a lot of what happened to them a year earlier, and these memories are still clear while they are 5 and 6, but by the time they are over 7, these memories become weaker rapidly.
一项新的研究发现，大多数三岁的孩子都能记得很多一年前发生在他们身上的事情，在他们5岁到6岁的时候，这些记忆仍然清晰，但当他们超过7岁时，这些记忆就会迅速变弱。
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