at the heart of sth.中等

While books are, and should always be, at the heart of any library, a multitude of other services are offered: employment advice, language classes or digital access and support.

虽然书籍是、也应该永远是任何图书馆的核心，但图书馆还提供大量其他服务：就业咨询、语言课程，或数字接入与支持。