相位裕度是系统在变得不稳定之前可以容忍的程度的度量。
文化的功能观点坚持这样的原则:在每一种文明类型中,每一种习俗、物质对象、思想和信仰都履行着某种重要功能,完成某种任务,代表着一个运作整体中不可或缺的部分。
Investing in farmer education is investing in the future of dairy.
Fruit is a noble cause,the cause of flower is sweet,but still let me in the obscurity of the shadow of the dedication to do it cause leaf.