preventive
/prɪˈventɪv; prɪ`vɛntɪv/ (also preventative / prɪˈventətɪv; prɪ`vɛntətɪv/) adj
(a) preventing or intendedto prevent sth; precautionary 预防（性）的; 防备的
preventive measures 预防性措施.
(b) (of medicine) preventing or intended to prevent disease; prophylactic （医学上）预防疾病的, 预防性的
research into preventive medicine, ie ways of preventing disease 研究防治学. preventive (also preventative), n thing (esp a medicine) used or designed to prevent sth 预防物; 预防性措施; （尤指）预防药.