单词 | frontier |
释义 | fron·tier (frŭn-tîr, frŭntîr′) n. 1. a. An international border. b. The area along an international border. 2. A region just beyond or at the edge of a settled area. 3. An undeveloped area or field for discovery or research: theories on the frontier of astrophysics. [Middle English frountier, from Old French frontier, from front, forehead, front; see FRONT.] |
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