Spammers use optical character recognition to defeat CAPTCHA, so there is usually significant distortion to the images.
垃圾信息散布者常常会使用视觉字符识别来破解CAPTCHA，所以通常我们需要严重歪曲这些图像。
Spammers use optical character recognition to defeat CAPTCHA, so there is usually significant distortion to the images.
垃圾信息散布者常常会使用视觉字符识别来破解CAPTCHA，所以通常我们需要严重歪曲这些图像。
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