actuary

n expert who calculates insurance risks and premiums (by studying rates of mortality and frequency of accidents, fires, thefts, etc) 精算师（保险业的专业人员, 以研究死亡率及事故, 火灾, 窃案等的频率为依据来估算风险和保险费者）.

action, action group, action painting, action replay, action stations, actionable, activate, activation, active, active service (US also active duty), actively, activeness, activist, activity, actor, actress, actual, actuality, actually, actuarial, actuate, acuity, acumen, acupuncture, acupuncturist, acute, acute angle, acute mark, acutely, acuteness, AD, ad hoc, ad infinitum, ad lib, ad nauseam, ad-lib, adage, adagio, Adam, Adam's apple,