英语语法分析

It intruded Eocene sandstones.

它侵入始新世砂岩。

The other was a feathered skull from the Eocene (55m years ago) that had been unearthed in Denmark.

另一个是在丹麦发掘到的始新世（5500万年前）的一根羽骨。

Few or any anthropoids are known to have existed in Africa during this period, known as the Eocene epoch.

人们原先不知道在这个被称为“始新世”的时期，非洲有类人猿的存在。