资料来源 : WordNet®

proactive
     adj 1: descriptive of any event or stimulus or process that has an
            effect on events or stimuli or processes that occur
            subsequently; "proactive inhibition"; "proactive
            interference" [ant: {retroactive}]
     2: (of a policy or person or action) controlling a situation by
        causing something to happen rather than waiting to respond
        to it after it happens