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.
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。
Each unknown word is presented as a CAPTCHA several times, to different users, to ensure that it has been read correctly.
UI - patterns是另外一个顶级用户界面库，收集展示了一些改进过的设计模型，比如验证码、帐户注册、导航标签等。
UI-patterns is another top-notch User Interface library that collects and showcases reoccurring design patterns such as Captchas, Account Registrations, and Navigation Tabs.
表单验证不仅将用户名写入Cookie，它还写入信息验证码(一种来自Cookie和只有服务器知道的密值的散列形式)。
Forms authentication not only writes the user's name into the cookie, it adds a message authentication code (a hash formed from the cookie and a secret value that only the Web server knows).
在注册页面中，请正确填写您的常用邮箱、用户名，进行密码设置、密码确认，并输入验证码。填写完毕后，请点击“立即注册”，提交注册信息。
On the registration page, enter your correct email and a username, create and confirm your password, and enter CAPTCHA. After the above steps are completed, click the.
如今，从在线退房到网银登陆，网站都可以用验证码和两步验证来确认用户的身份。
From online check-outs to banking login screens, sites today use tools like captchas and two-step verification to confirm a consumer's identity.
如今，从在线退房到网银登陆，网站都可以用验证码和两步验证来确认用户的身份。
From online check-outs to banking login screens, sites today use tools like captchas and two-step verification to confirm a consumer's identity.
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