1.b> 1) ; Italy's French frontier - ; the frontier follows a river-valley ; to defend one's frontiers ; to cross the frontier ;
2) ;
2.b> .i> 1) ; frontier of knowledge ; ; the frontier of drama and melodrama ;
2) / ( i>); the latest frontiers of linguistic research ;
3.b> . .i> -i> ; -i> ;
4.b> .i> , ;
frontier town [incident] [].