致力于: devote oneself to/hammer at/apply oneself to/bend oneself to/commit oneself to...
防火墙: firewall...
巨人: giant...
中小学: middle and elementary school...
记性: memory (ability to retain information)...
黄瓜: cucumber...
冬季: winter...
乡镇: village, township...
打交道: to come into contact with, to have dealings...
前提: premise, precondition, prerequisite...
