“业余爱好”常见的英文表达是 hobby ，它是一个可数名词，复数形式为 hobbies。例如：
I have many hobbies, such as reading, painting and playing the guitar.（我有很多业余爱好，比如阅读、绘画和弹吉他。）
His hobby is collecting stamps.（他的业余爱好是集邮。）