specialization

n.专攻；专门研究

speaker, speaking, speaking clock, spear, spear gun, spearhead, spearmint, spec, special, special agent, Special Branch, special constable, special delivery, special licence, special pleading, special school, special student, specialise, specialist, speciality, specialization, specialisation, specialize, specialize, specialise, specialized, specialized, specialised, specially, specially-made, specialty, specie, species, specific, specific gravity, specifically, specification, specificity, specify, specimen, specious, speciously, speciousness,