Systems in our universe move from order to disorder, and it is that property of the universe that defines the direction of time's arrow.

们宇宙中的系统会从有秩序变得无秩序。正是宇宙的这个属性，定义了时间之箭的方。

Probably the most important one, from some points of view the defining property, is that it is its own derivative.

从某些角度来看，最重要的一个定义属性可能是它是它自己的衍生物。

More specifically, it refers to the defining properties of these general units: the categories of the noun, for example, include number, gender, case and countability; and of the verb, for example, tense, aspect, voice, etc.

更具体地说，它指的是这些一般单位的定义属性：例如名词的类别包括数、性、格和可数性；动词的类别包括时态、体、语态等。