翻译英语

it buys some of its books and gets others as gifts. It also gets materials through its copyright office. Anyone who wants copyright protection for a publication must send two copies to the library.

美国国会图书馆的书籍有些是购买的，有些是他人作为礼物赠送的。它也从版权管理机构获得资料。任何想要对其出版物进行版权保护者必须送两份副本给图书馆。