现存的准则是一团乱麻，一个从上一辈那继承来的各种规定的混合物，还充斥着各种例外条款。
The existing standards are a shambles, a patchwork of inherited rules riddled with escape clauses.
这种方式完美地诠释了DRY (Dont Repeat Yourself)准则，因为持久化逻辑只实现一次，在需要的时候可以多次混合到领域类中。
This approach perfectly epitomizes the DRY (Don't Repeat Yourself) principle, since the persistence logic is implemented once and mixed in domain classes as many times as needed.
该准则分为基于混合基阵和信号估计两种。
The criterion is divided into two parts based on mixing matrix and source signals.
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