| 单词 | frontier |
| 释义 | frontierfrontier /frʌnˈtɪr/ ●●○ noun 1the frontier the area beyond the places that people know well or live in, especially in the western U.S. in the 19th century: pioneers of the American frontier Alaska is known as the last frontier.2[countable] the limit of what is known about something: Researchers are pushing back the frontiers of science.3[countable] social studies, politics the border of a country, or the area near the border: a picturesque village near the Italian frontierfrontier between/with The frontier between France and Spain runs along the river here. |
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