active

a.有活力的，积极的，主动的

acropolis, across, across from, acrostic, acrylic, act, act as, act for, act on, act out, acting, actinism, action, action group, action painting, action replay, action stations, actionable, activate, activation, active service (US also active duty), actively, activeness, activist, activity, actor, actress, actual, actuality, actually, actuarial, actuary, actuate, acuity, acumen, acupuncture, acupuncturist, acute, acute angle, acute mark,