塔西佗的《编年史》是研究古罗马历史的重要文献。

___Tacitus's 'Annals' is an essential document for studying ancient Roman history.

古老的森林笼罩在一片静谧之中，仿佛隐藏着无数秘密。

The ancient forest was wrapped in a ___taciturn atmosphere, as if holding countless secrets.