No statistical model, for example, can describe with perfect accuracy all the e-mails you might legitimately receive, while labeling the rest as spam.

例如，没有哪种统计模型可以准确无误地描述你收得的所有电子邮件中的合法邮件，而标记其余的为垃圾邮件。

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“If the benefit a spammer is getting from obtaining an e-mail account is less than $3 per 1,000, then CAPTCHA is doing a perfect job,” says Dr von Ahn.

von Ahn博士说:“如果一个司盘客获取一个邮箱账号得到的钱少于千分之三美元，那么验证码系统的效果就恰到好处了。”

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This is a perfect fit for many of the classic types of Web applications such as content management systems, search applications, and e-commerce sites, just to name a few.

对于很多经典的Web应用程序，例如内容管理系统、搜索应用程序和电子商务站点等等而言，这非常适合。

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Sophisticated analyses were used to perfect fundraising e-mail campaigns and messaging that would yield the best results.

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As the perfect combination e-reader, media player and portable computing device, HTC EVO View 4G offers a 7-inch 1024 x 600 touchscreen display with pinch-to-zoom for a premium entertainment experience with HD-quality video and rich Web browsing experience.

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