It is impossible to have a cyclic machine that completely converts the random molecular energy of heat flow into the ordered motion of mechanical work . 不可能得到一种循环机器能把热流的无序的分子能量完全转变为机械功的有序运动。
Element provides an unordered grouping of elements 元素提供无序的元素分组。
An object is an unordered set of name / value pairs 对象是一个无序的“ ‘名称/值’对”集合。
Node set : an unordered collection of nodes without duplicates 节点集:无序的节点集(没有重复项)