向量场是科学和工程中的重要概念，描述物理过程中的方向信息和状态的变化趋势。
Vector field is important conception in science and engineering, which describes directional information of physical procedure and developing trends of states.
本标准主要描述了乱翻滚式测试仪，对纺织品材料抗起球性能和有关织物表面变化趋势的评价。
This test method covers the resistance to the formation of pills and other related surface changes on textile fabrics using the random tumble pilling tester.
方法应用描述性统计方法分析生育率、初婚初育年龄、婚育间隔、生育间隔和出生性别比及其变化趋势。
Methods The statistical description of fertility rate, age at first marriage, age at first birth, interval between marriage and first birth, birth interval.
本文采用物质流分析方法描述了我国经济系统的资源消耗特征和变化趋势。
By way of material flow analysis, this paper demonstrates resource consumption characters as well as dynamic trends of our country's economy system.
年龄时期队列模型广泛应用于描述性流行病学来分析慢性病发病率和死亡率变化趋势，它改进了传统的疾病描述性分析方法。
Age period cohort model is widely used by epidemiologists to analyse trends of chronic diseases. The statistical model provides a useful modification for traditional descriptive epidemiology.
通过管中心和其它管线的速度变化趋势，以及圆管径向的速度分布，描述了流场的整体流动特性，揭示了非牛顿流体管道流的速度过冲和振荡现象。
They can easy show the behaviors of the flow in the whole cube, reveal the phenomenon of locity overshooting and damping oscillation of the flow.
通过管中心和其它管线的速度变化趋势，以及圆管径向的速度分布，描述了流场的整体流动特性，揭示了非牛顿流体管道流的速度过冲和振荡现象。
They can easy show the behaviors of the flow in the whole cube, reveal the phenomenon of locity overshooting and damping oscillation of the flow.
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