The most popular such method is CAPTCHA.
最常见的一种方法是CAPTCHA。
Figure 3 is an example of a CAPTCHA image.
图3是CAPTCHA 图像的一个例子。
Are some CAPTCHA devices better than others?
是否有些CAPTCHA设备比其他设备更好？
I enter a captcha, and click the submit button.
我输入了验证码，然后点击了提交按钮。
The image is then presented as a CAPTCHA in the usual way.
然后这个图片以常规方式显示为验证码。
The most simple negative CAPTCHA is one hidden honeypot field.
大多数简单的negative CAPTCHA就是一个隐藏的‘蜜罐’域。
Of course, but picking the right CAPTCHA device is an implementation detail.
当然，选择正确的CAPTCHA设备是一个实现细节。
Of course, but picking the right CAPTCHA device is an implementation detail.
当然，选择正确的CAPTCHA设备是一个实现细节。
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