效力的英文：
serve
potence
force
efficacy
參考例句：
potent liquor;a potent toxin.
有效力的酒;有效力的'毒素Time works wonders.
時間可以創造奇蹟或時間的效力不可思議。feeling of efficacy
效力感 The law should remain in force.
法律應當有效力。The medicine is efficacious
這藥很有效力。a retrospective pay rise
有追溯效力的加薪. an ex post facto law
有追溯效力的法律Efficiency will be multiplied several times.
效力將提高好幾倍。The legislation was made retrospective.
該項法規具有追溯效力。The patriot rendered services to his country all his life.
愛國者畢生為國家效力。serve是什麼意思：
v. 為...服務；供應；任（職）；服役
n. 發球（權）
to serve the landlord
為地主幹活Persons serving on the Appellate Body shall serve in rotation.
上訴機構人員任職應實行輪換。They drafted him to serve as their delegate.
他們選派他作他們的代表。potence是什麼意思：
n. 力量,權力,效力
All their songs have a lingering potency.
他們所有的歌曲都有揮之不去的影響力。They testify to the extraordinary potency of his personality.
這些事情證明了他非凡的人格魅力。The drug will lose its potency when exposed to moisture.
這藥一受潮就會失效。force是什麼意思：
n. 軍隊，暴力
v. 強迫，用力推動
by (main) force
用蠻力, 全靠氣力; 以最大的力氣 The force is spectacular!
這個瀑布很壯觀！resultant force
