通过这个项目，我们将进入未知的领域。

With this project, we'll be moving into unknown ___territory.

探索新的、未知的领域一开始可能有些令人害怕。

Exploring new, unknown ___territory can be somewhat frightening at first.

她的专长在于认知心理学领域。

Her expertise lies in the ___territory of cognitive psychology.