他只是一名在周末喜欢拍照的业余摄影师。

He's just an ___amateur photographer who enjoys taking pictures on weekends.

她是一名在当地戏剧中为乐趣而表演的业余演员。

She's an ___amateur actor who performs in local plays for fun.

许多业余天文学家为科学做出了重要贡献。

Many ___amateur astronomers make significant contributions to science.