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证明你不是机器人从未如此困难,原因何在?
“人机验证”(Captcha)这个用来判断你是人类还是机器人的测试越来越难了。“人机验证”的设计初衷是为了防止恶意机器人进入某些网站,但问题在于,每当你成功完成了一次“人机验证”,实际上都使那些机器人变得更聪明了。最初简单的文本验证,如今已迅速演变成 ...
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