效力的英文：
serve
potence
force
efficacy
- potent liquor;a potent toxin.
有效力的酒;有效力的毒素 - Time works wonders.
时间可以创造奇迹或时间的效力不可思议。 - feeling of efficacy
效力感 - The law should remain in force.
法律应当有效力。 - The medicine is efficacious
这药很有效力。 - 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.
效力将提高好几倍。 - The legislation was made retrospective.
该项法规具有追溯效力。 - The patriot rendered services to his country all his life.
爱国者毕生为国家效力。
v. 为...服务；供应；任（职）；服役
n. 发球（权）
- to serve the landlord
为地主干活 - Persons serving on the Appellate Body shall serve in rotation.
上诉机构人员任职应实行轮换。 - They drafted him to serve as their delegate.
他们选派他作他们的代表。
n. 力量,权力,效力
- All their songs have a lingering potency.
他们所有的歌曲都有挥之不去的影响力。 - They testify to the extraordinary potency of his personality.
这些事情证明了他非凡的人格魅力。 - The drug will lose its potency when exposed to moisture.
这药一受潮就会失效。
n. 军队，暴力
v. 强迫，用力推动
- by (main) force
用蛮力, 全靠气力; 以最大的力气 - The force is spectacular!
这个瀑布很壮观！ - resultant force
合力