Pros get paid for what they do, whereas amateurs don't.

职业选手工作有报酬，而业余爱好者没有。

This work was done by a bunch of amateurs!

这项工作是一帮外行干的！

Amateurs fall by the wayside when the going gets tough.

初学者们遇到困难就半途而废。

The tournament is open to both amateurs and professionals.

这次锦标赛业余选手和职业选手均可参加。

He turned his country house into a place where professionals and amateurs collaborated in the making of music.

他把他的乡间小屋变成了业内外人士合作制作音乐的场所。