你好！
“好书值得珍藏”这个表达的英文翻译是 "a good book is worth keeping."
这个表达的来源可能来自于一句谚语："A good book is a treasure."（好书是宝藏）。这句谚语是用来表示一本好书的价值，因为它可以帮助我们增长知识、提升思维、开拓视野等。
下面是一些使用这个表达的英文例句：
"I have a whole shelf of books that are worth keeping. They've taught me so much and I love being able to revisit them whenever I want."（我有一整个书架的书都值得珍藏。它们教给了我很多东西，而且我喜欢随时都能重新阅读它们。）
"I always make sure to buy a hardcover version of a good book because I know it's worth keeping for a long time."（我总是确保买一本好书的精装版，因为我知道它值得长期保存。）
"I have a lot of books that I've read and loved, but there are some that are just so special and valuable to me that I know I'll keep them forever."（我有很多我读过并喜欢的书，但有些书对我来说特别重要且有价值，所以我知道我会永远保留它们。）
希望这些信息对你有帮助！