【Effetive】
effective a. 有效的,有影響的
例:The president promised swift and effective retribution against the terrorists.
總統答應會迅速有效地懲罰恐怖分子。
Advertising is often the most effective method of promotion.
登廣告往往是最有效的推銷方式。
拓展:effect n. 影響,結果;effectiveness n. 有效性