易混淆的单词： Foolproof

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Washington 's increased security barriers aren 't always foolproof .

虽然华盛顿的防护路障越来越多，却并不是万无一失。

Try this foolproof technique to spice up your shots .

试试这个简单的技巧，让您的照片更加美味。

They think that having an ultrasound is a foolproof method .

他们认为照超音波是一种安全的方法。

A foolproof way to save money on rent is to have a roommate or two .

要省钱的可靠方式还是找一个或两个合租的室友。

While condoms are not foolproof , they are highly effective in preventing hiv infection .

虽然避孕套并不绝对安全，但它们防止艾滋病毒感染的效果非常显著。