Regardless of whether we consider the physical systems themselves or their individual constituent parts, they share some common physical properties, such as weight, length, width, height, etc.
如果不考虑它们究竟是作为物理系统还是作为某一个组成部分的话，它们共有着一些通用的物理属性，比如重量、长度、宽度、高度等等。
Conversion and validation allow you to focus on business logic rather than the tedious qualifications of input data such as null checks, length qualifiers, range boundaries, etc.
转换和验证使您可以侧重于业务逻辑，而不是侧重于对输入数据进行繁琐的资格认定，比如null检验、长度限定、范围边界，等等。
These policies mandate the minimum length of password and minimum number of classes (as in alphabets, numerals, and special characters, etc).
这些策略制定了密码的最小长度以及类的最少数量(比如字母、数字和特殊符号中的类的数量)。
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