belt line

(US) bus or train service that operates around the edge of a city or city area 环城线（围绕城市外缘或市区行驶的公共汽车或火车服务系统）.

belligerently, bellow, bellows, bellwether, belly, belly-button, belly-dance, belly-dancer, belly-flop, belly-laugh, bellyache, bellyful, belong, belong in, belong to, belonging, belongings, beloved, below, belt, belting, bemoan, bemused, ben, bench, bench seat, bench-mark, bend, bend one's knee to, bender, bends, bendy, beneath, Benedictine, benediction, benefaction, benefactor, benefactress, benefice, beneficed,