frontier

中文意思

• n. 边境
• n. 国界
• n. 前沿

英文释义

• n. a wilderness at the edge of a settled area of a country
• n. an international boundary or the area (often fortified) immediately inside the boundary
• n. an undeveloped field of study; a topic inviting research and development

词形变化

复数

frontiers

例句

1. n. 边境

   The soldiers were sent to protect the country's remote frontier.

   士兵们被派去保卫国家偏远的边境。

2. n. 国界

   Travelers must show their passports before crossing the frontier.

   旅客在穿过国界之前必须出示护照。

3. n. 前沿

   Artificial intelligence is currently the new frontier of technology.

   人工智能是目前科技的新前沿。