但专家认为，黑客很容易就可以骗过系统，比如按系统可接受的频率破译密码。
But experts say that the hackers simply learn to trick the system, by making guesses at an acceptable rate, for instance.
在同源性方面，在进化上比较接近的物种，基因的密码子使用频率和使用偏性指标比较接近或基本相同。
Moreover, species with near homology relationship on evolution share the near codon usage frequency and preference index or the similar index.
一种实例性的密码政策可以包括对密码的长度和密码所用字母的要求，更改密码的频率以及允许登录错误的次数。
An example password policy would include requirements for the length and characters used in the password, how frequently they must be changed, and the number of failed login attempts allowed.
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