The number of juveniles in the general population has fallen by a fifth in the past 10 years.

在过去的10年中，青少年在总人口中所占的比重下降了1/5。

It's also true to the juveniles.

它也是真正给青少年。

Nor should juveniles.

未成年人也不应该登记在册。

And why most of them are children and juveniles?

为什么大部分是儿童与少年？

Youth and juveniles are the main part of immoralities on web.

青少年是互联网上不道德行为的重要主体。