| 单词 | frontier |
| 释义 | frontier n. 1. a the border between two countries. b the district on each side of this. 2. the limits of attainment or knowledge in a subject. 3. US the borders between settled and unsettled country. Derivatives frontierless adj. Etymology: ME f. AF frounter, OF frontiere ult. f. L frons frontis FRONT |
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