It's a sealed book to me.

我对这一窍不通。

When Hermann Boerhaave，a Dutch physician and chemistbest known for his Elementa chemae，died in 1738，he left behinda sealed book with the title The Onliest and Deepest Secrets ofthe Medical Arts.

以《化学基础》一书闻名的荷兰医生和化学家赫尔曼·布尔哈夫于1738年去世时留下了一本题为《医学艺术唯一的和最深刻的秘密》的封着的书。