treasure trove
noun
mass noun
1- English Law (abolished in 1996) valuables of unknown ownership that are found hidden and declared the property of the Crown【英格兰律】埋藏物（指埋在地下的无主财宝, 若被发现应归政府所有; 1996年该法律被废除）。
1.1
- count noun a hidden store of valuable or delightful things不为人所知的有价值收藏：
your book is a treasure trove of unspeakable delights.
你的书是本可以带来难以言喻快乐的宝书。
词源
late Middle English: from Anglo-Norman French tresor trové, literally 'found treasure'.