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I am using Recaptcha using the following link http://www.google.com/recaptcha

But, I observed, it not 100% accurate. It validates as success, if we type 2-3 letters wrongly.

Is there a setting, which will make it 100% accurate.

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Now, If a user types "tentace veri", it still validates SUCCESS. Why can't it be 100% accurate.

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不，Recaptcha 只知道一个词，它使用众包来表示另一个词，这就是为什么它说“数字化......”它实际上是在使用人类来数字化书籍。你可以输入tentace helium，它会起作用。甚至有一个互联网运动用脏词代替第二个词。你可以分辨出它知道哪一个，因为它会扭曲它。

于 2013-04-25T17:42:12.790 回答