许多互联网公司使用验证码技术（全自动区分计算机和人类的图灵测试）判断用户是人类还是机器。验证码技术包括将图片中的字母和数字输入文本框。验证码通常在用户在博客上发表评论，创建服务账户，买票或者填写「忘记密码」表单的时候出现。 2009 年谷歌为了创建旧报纸和书籍可检索存档，收购了一个叫做...
many Internet Co use verification code technology (automatic distinguish the Turing test computer and human) determine the user is a human or a machine. The verification code technology including the letters in the picture and the digital input text box. The verification code is usually in the user comments on blogs, create a service account, buy tickets or fill in "forget the password" the form appears. In 2009 Google in order to create the old newspapers and books searchable archive, bought a called...
