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。

《柯林斯英汉双解大词典》

Shop-lifters can be divided into three main categories: the professionals, the deliberate amateurs, and the people who just can't help themselves.

商店扒手可分为三大类：专业人士、有意为之的外行和无法控制自己的人。

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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。

《牛津词典》

But Kaggle also attracts professionals and amateurs from a wide range of fields worldwide.

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It was a place certain to be filled with cameras held by professionals and amateurs alike.

NPR: On Screens, Familiar Images Of Terror Flash

Even though those understanding the complex characters are ever fewer, the art of seal engraving is still practised by both professionals and amateurs.

UNESCO: Culture