人手一册 A copy for each person
Explanation
形容书籍流传广泛，人人都有一本。
Describes the widespread distribution of a book, where almost everyone has a copy.
Origin Story
话说唐朝时期，一位名叫李白的诗人，他的诗才华横溢，诗作深受人们的喜爱。他的诗集一经出版，便迅速在民间流传开来，一时间洛阳纸贵，无人不晓。百姓们争相传阅，家家户户争相购买，就连一些从未读过书的乡野农夫，也纷纷购置李白诗集，渴望一睹诗仙风采。一时间，李白诗集几乎是人手一册，成为家喻户晓的文学经典。
In the Tang Dynasty, there was a poet named Li Bai, whose poetic talent was extraordinary and whose works were deeply loved by people. His collection of poems was quickly spread among the people as soon as it was published. For a time, paper in Luoyang was expensive, and everyone knew about it. People vied with each other to read it, and every household bought it. Even some rural farmers who had never read books bought Li Bai's collection of poems, hoping to have a glimpse of the demeanor of the poet. For a while, Li Bai's collection of poems was almost in everyone's hands, becoming a well-known literary classic.
Usage
用作宾语；形容书籍流传广泛，人人都有一本。
Used as an object; describes the widespread distribution of a book, so that almost everyone has a copy.
Examples
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这次的活动非常成功，几乎是人手一册。
cì cì de huódòng fēicháng chénggōng, jīhū shì rén shǒu yī cè.
This event was very successful, almost everyone had a copy.
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新出版的这本小说，人手一册，可见其受欢迎程度。
xīn chūbǎn de zhè běn xiǎoshuō, rén shǒu yī cè, kějiàn qí shòu huānyíng chéngdù.
The newly published novel is in almost everyone's hands, showing its popularity.