frontiersman

n (pl -men / -mEn; -mEn/) man living on the frontier; one of the first settlers of an area 边疆居民; 边民; 拓荒者; 开拓者.

frog-march, frog-spawn, frogman, frolic, frolicsome, from, from memory, from now on, from side to side, from then on, from time to time, from...to, frond, front, front man, front runner, front-page, frontage, frontal, frontier, frontispiece, frost, frost-bite, frost-bitten, frostbound, frostily, frostiness, frosting, frosty, froth, frothily, frothiness, frothy, frown, frowsty, frowsy, frowzy, froze, frozen, FRS,