这个古董市场对收藏家来说真是个金矿，他们总能淘到价值连城的宝贝。

This antique market is a ___goldmine for collectors, where they always find priceless treasures.

这家二手书店是一个珍贵的资源库，里面有很多绝版书。

This used bookstore is a ___goldmine of rare out-of-print books.