由于反馈器件的限制，高速伪码不能采用单独依赖提高时钟频率的方法。
Because of the limits of feedback devices, high speed pseudo noise code generation cannot depend simply on the improvement of clock rate.
如果对象不能被改变，那么哈希码也永远不变。
If the object cannot be altered, then the hash code will never change either.
这意味着验证码的设计者们不能仅靠增加文字扭曲程度来打击攻击验证系统的人。
This means designers of CAPTCHAs cannot simply increase the amount of distortion to foil attackers.
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