药物存放太久，可能会失去效力。
防晒霜在盥洗室柜子里放置一个冬天后会失去效力。
Sunscreen can lose its potency if left over winter in the bathroom cabinet.
酒精会增加药物的效力。
随着公共卫生的结构性问题越来越难以忽视，对政府过度保护的控诉便失去了效力。
As the structural nature of public health problems becomes harder to ignore, the complaint about over protective government loses potency.
名字的另一半代表了另一种成分，也许不那么臭名昭著，但也有奇特的效力：可乐果。
The other half of the name represents another ingredient, less infamous, perhaps, but also strangely potent: the kola nut.
压力反应会降低身体免疫系统对抗疾病的效力，从而增加对感冒和癌症等疾病的易感性。
Stress reactions can reduce the disease fighting effectiveness of the body's immune system, thereby increasing susceptibility to illnesses ranging from colds to cancer.
如果像肯尼迪这样的人愿意保持演讲的简短以最大化他们作为演讲者的效力，我们也应该足够聪明做同样的事情。
If people like Kennedy are willing to keep it short to maximize their effectiveness as speakers, we should be smart enough to do the same thing.
他们效力最强的武器是飞鱼导弹。
此类有追溯效力的立法还鲜有先例。
There are few precedents for this sort of retrospective legislation.
这些指导原则不具有法律效力。
我感谢他们长期忠诚的效力。
这种疫苗对流感的免疫效力时间较长。
这一裁决应该具有追溯效力。
新的规定将具有追溯效力。
一项官方法令使首都的投票失去了效力。
我无法相信，他几句好听的话就哄得你为他效力！
I can't believe you let him sweet-talk you into working for him!
对忠心效力国家多年的士兵们来说，这是不公平的。
It is unfair to soldiers who have served their country well for many years.
他们的魔咒效力怎么能持续到半夜？
袁不仅为中国人民效力，也为世界人民效力。
Yuan works for the people not only in China but also around the world.
他的精神总是鼓舞着我们尽最大努力为祖国效力。
His spirit always encourages us to try our best to serve our motherland.
托尼已下定决心毕业后成为一名军人，为国效力。
Tony has made up his mind to be a soldier to service the country after graduation.
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