原文：I looked into why old books smell so good, and it turns out the vanilla-like scent comes from the breakdown of lignin in the paper, so that cozy library smell is actually centuries of decay.
译文：我查了为什么旧书的味道那么好闻，原来是纸张里的木质素分解产生了类似香草的气味，所以图书馆那股好闻的味道其实是几百年的缓慢腐烂。
