I see at wordspy.com the first citation for captcha is October 2002.
我在wordspy.com看到的第一条captcha的引文是在2002年十月份。
The New Oxford American Dictionary is the only conventional dictionary I came across that has captcha as an entry, yourdictionary.com the only online one.
我所遇到的传统词典中，只有新牛津美语词典收录了captcha词条；在线词典中，只有yourdictionary.com对其有所收录。
To validate the captcha we need to save the random text written to the captcha image somewhere and then check it at the form submission time.
为了对验证码进行检验，我们需要将验证码中的文本保存起来，然后在提交的时候进行检查是否一致。
That string of letters has a name; it's called a CAPTCHA. And it's a test.
这串字母叫做CAPTCHA，它是一个测试。
Fend them off with more generic error messages and possibly require to enter a CAPTCHA.
用更通用的错误信息来阻断这种攻击，可能需要输入一个验证码。
The CAPTCHA wasn't entered correctly. Go back and try it again.
你没有正确输入验证码，请刷新后再试。
Even better, the system has proved to be far better at resisting attacks than other types of CAPTCHA.
更妙的是，这一系统已经证明其在抵御攻击方面比其他类型的验证码具有更加卓越的性能。
He gives an example: a CAPTCHA in which each letter was always formed out of the same number of pixels.
他举了一个例子：在一个验证码中，每个字母都是由一定数量的像素组成的。
Readers might have noticed that both of Google's CAPTCHA systems suddenly become more difficult to parse.
读者可能已经注意到Google的CAPTCHA系统突然变得更难识别。
The point of the CAPTCHA is that reading those swirly letters is something that computers aren't very good at.
该测试的重点在于，对于计算机来说，它们不善于辨识这些纠结的字母。
If you've signed up for any sort of online service there is a high likelihood you're very familiar with CAPTCHA.
如果您曾经需要在线注册任何形式的网上服务，你很可能已经熟悉了CAPTCHA。
Perhaps Captcha or another security measure to prevent such spamming will be instituted to prevent any such issues.
也许通过验证码或其他措施可以有效防止类似问题。
A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.
一个CAPTCHA程序能够生成一些人类能通过，但是目前的计算机却无法通过的测试。
Each unknown word is presented as a CAPTCHA several times, to different users, to ensure that it has been read correctly.
每一个未知词作为验证码呈现给不同用户数次，确保它被正确辨认。
This paper deeply researches on EKE protocol and CAPTCHA on the base of the knowledge of Data Encryption and Information Security.
本文主要在掌握了一定的数据加密与信息安全、身份认证等知识的基础上，对EKE协议和CAPTCHA作了较为深入的研究。
Even if those Numbers exaggerate the system's efficacy tenfold, though, it would still represent a significant blow to the CAPTCHA model.
即便这些结果是实际系统效用的10倍，也仍然是对CAPTCHA模式的一记重击。
Their assorted techniques recognise anywhere between half and nearly all letters and numbers, depending on the particular CAPTCHA algorithm in use.
根据具体使用的CAPTCHA算法，他们的分类技术对数字和字母的识别率可以达到50%至将近100%之间。
CAPTCHA is a program that can generate and grade tests that most humans can pass, but current computer programs can't pass (typically a picture with distorted text).
CAPTCHA是可以生成并分级测试的程序，这些测试人可以通过但当前计算机程序却不可以(很典型地如一个有无序文本的相片)。
Luis von Ahn, an assistant professor at Carnegie Mellon who was part of the original CAPTCHA team, estimates that people fill out close to 200 million CAPTCHAS a day.
卡内基·梅隆大学助理教授LuisvonAhn曾是CAPTCHA小组的成员，他估计每天约有2亿个CAPTCHA被用户填写。
A CAPTCHA is a program that can generate and grade tests that most humans can pass, but current computer programs can't pass (typically a picture with distorted text).
CAPTCHA是可以生成并分级测试的程序，这些测试人可以通过但当前计算机程序却不可以(很典型地如一个有无序文本的相片)。
And some people, such as the visually impaired, cannot see CAPTCHA images at all, so this technique exhibits poor accessibility, and can even be illegal in some circumstances.
有些人，比如视觉障碍人士，根本就看不到captcha图像，所以这个技巧的适用性比较差，在某些情况下甚至是不合法的。
Even with the mild distortion in this example, spammers have been able to defeat such CAPTCHA, so their adversaries have resorted to greater and greater levels of distortion, as in figure 4.
虽然在本例中图像有所歪曲，垃圾信息散布者仍然能破解CAPTCHA，所以需要更高程度的歪曲，如图4所示。
When users solve a CAPTCHA through reCAPTCHA, the software will give users two words: one with a known answer (the control word) and one where the OCR software wasn't quite sure what the word was.
当用户被要求输入验证码时，用户可以看到两个单词：一个是已知的单词（控制单词），另一个是OCR软件无法确认的单词。
When users solve a CAPTCHA through reCAPTCHA, the software will give users two words: one with a known answer (the control word) and one where the OCR software wasn't quite sure what the word was.
当用户被要求输入验证码时，用户可以看到两个单词：一个是已知的单词（控制单词），另一个是OCR软件无法确认的单词。
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