translation.en: Now, the National Institute of Standards and Technology has a set of guidelines which have some rules of thumb for measuring entropy, but they don't have anything too specific, and the reason they only have rules of thumb is it turns out they don't actually have any good data on passwords.
translation.zh: 现在，国家标准技术局 有一系列的标准 这些标准中有一些粗略的方法 用来测量无序性 但是他们并没有很详细的方法 他们只有粗略的方法的原因是 他们事实上并没有很多好的的数据 来研究密码