于是便动手写了一个插件，不仅可以采用数学等式验证，更可以使用图片验证码。
Robots may post lots of spam comments into your database. You can add a verification code image or a math equation to avoid this.
然后这个图片以常规方式显示为验证码。
四月发表的论文，是利用新程序对该公司存档的街景图片中进行了文本的识别试验，不出所料，在与验证码的比赛中，新程序击败了日益复杂的人工智能。
The April paper came out of work on text recognition in images from the firm's Street View archive, and of course on ReCAPTCHA's arms race to defeat increasingly sophisticated artificial intelligence.
输出验证码图片是很容易的，但复杂的部分来了。
Until now it was easy, but the most complicated part is coming.
输出验证码图片是很容易的，但复杂的部分来了。
Until now it was easy, but the most complicated part is coming.
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