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。
Urban-rural differences in dental caries of 5-year old children in Scotland.
《苏格兰五岁儿童龋齿的城乡差异》，凯特·a·列文等，爱丁堡大学。
Objective: to investigate the deciduous tooth caries experience of 5 year old children in Yunnan province.
目的：了解云南省5岁儿童乳牙龋齿患病情况。
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