フロンティア

noun

frontier (esp. American frontier)

Refers to the historical American frontier, the edge of settled land, often with a sense of adventure and expansion.

• 西せい部ぶ開かい拓たく時じ代だいのフロンティアには多おおくの危き険けんがあった。

  There were many dangers on the frontier during the Wild West era.

noun

frontier (of a field); forefront (of science, technology)

Used for the cutting edge or unexplored areas of academic, scientific, or technological fields.

• この研けん究きゅうは宇う宙ちゅう科か学がくのフロンティアを切きり開ひらくものだ。

  This research opens up a new frontier in space science.