youngster可数吗

　　The youngster just doesn't know what it is to be tired.

　　这小伙子有一股子使不完的劲儿。

　　He liked this straightforward, outspoken youngster.

　　他喜欢这个小伙子，心直口快，有啥说啥。

　　The two men had taught the youngster the love of the country.

　　他们俩教导孩子热爱这乡土。

　　Give a youngster a computer and he can crack absolutely anything.

　　给年轻人一台计算机，他绝对可以破坏一切。