frontier

国境、境界

他国や、定住地の外にある地域と接する国の境界。

やさしい英語で： The edge of a country where it meets another country or an area beyond its settled land.

• They crossed the frontier at dawn.
• Troops gathered near the northern frontier.
• The frontier between the countries follows the river.

使い方： frontier between A and B (Soldiers guarded the frontier between the two countries.); frontier with something (They reached the country’s frontier with Spain.)

類義語： border, boundary

よく使う表現： cross the frontier, frontier town, frontier with something

最前線、新領域

知識や発展が最も進み、新しい発見や変化が生まれる領域。

やさしい英語で： The furthest point reached in knowledge or development, where new discoveries and changes happen.

• Space remains a frontier of discovery.
• Scientists are exploring new frontiers in medicine.
• Their work lies at the frontier of computer technology.

使い方： frontier of something (She works at the frontier of medical research.)

類義語： leading edge, cutting edge

よく使う表現： frontier of science, new frontier, at the frontier

開拓地、辺境

町や農場ができた地域の先にある、入植者の少ない土地。

やさしい英語で： Land with few settlers, beyond areas where people have already built towns and farms.

• They built a cabin on the frontier.
• Life on the frontier was often difficult.
• Settlers moved west as the frontier expanded.

類義語： wilderness

よく使う表現： the western frontier, on the frontier, frontier life