foil
单词辨析：
指阻止某人做成坏事。
to foil a plot
挫败阴谋
His attempt to rob the bank was foiled by the police.
他抢劫银行的企图被警察挫败了。
指阻止某人的计划、努力、意图等，使之不能成功，通常用被动语态。
Our plan to go on a picnic was frustrated by his sister.
我们去野餐的计划因为他姐姐的阻止而泡汤了。
Their attempt to get a signature from him was frustrated by the guards.
她们想找他要个签名，但是被警卫拦住了。
相关例句：
He thought of her serenity as a foil for his intemperance
在他看来，她的平静反衬出了他的放纵。
A hospital is to fit newborn babies with electronic tags to foil kidnappers
一家医院计划在新生儿身上安置电子追踪器，防止婴儿被拐卖。
An ugly woman serves as a foil to a pretty girl.
一个丑女人可以将美丽的姑娘反衬得更加漂亮。
Red flowers must have green leaves as a foil.
红花要有绿叶衬托。
Dad handed me a big box wrapped in gold foil and tied with a red ribbon.
爸爸递给我一个用金箔包装、外面扎了根红丝带的大盒子。
Varndell made his own reflector for these shots from a strip of humble kitchen foil.
瓦恩德尔用一狭条普通的厨房用箔纸自制了反光板来拍摄这些照片。