So it is with the forebrain's myelination during the late teens and early 20s.
2
义务教育的时间是8年，从5岁开始读小学至14岁初中毕业。
The duration of compulsory education is 8 years, starting from primary education at the age of 5 up to completion of junior secondary at the age of 14.
3
卓别林五岁初次登台表演，到十七岁他已经是一个喜剧综艺团中的主要演员了。
He first went on stage at the age of five, and by seventeen he was a leading member of a music hall group.
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