寻找前后两个都是重要词的ngram(the/barbed/a/of/razor/chicken/copper/and/live/with/high/telephone/piano/by/trip/baling/concertina)wire.(a/on/to)wirerack(the/barbed/a/of/,/razor/copper/chicken/and/concertina/high/live/steel)wire,(barbed/the/of/a/razor/chi