velocity: n.1.迅速；快速。2.速度，速率。3.周转率。短语和例子at a velocity of 100 miles per hour 用每小时一百英里的速度。 dart off with the velocity of a bird 像鸟一样迅速飞跑过去。 drag-free velocity无阻力飞速，真空飞速。 escape velocity(克服地球引力的)第二宇宙速度，
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Analysis is done on the change rules of liquid " s temperature along with the pipeline " s distance . the paper points out the defects of the const pressure wave velocity method and do some improvements on it : rebuilding the expressions of the pressure wave velocity in accordance with the simpson ' s rule 分析了管道内的流体温度随传输距离而变化的规律，并指出了此规律对管道负内压力波传播速度的影响。指出了常负压力波波速定位方法的局限性，并采用改进的负压力波定位技术，将管道内的负压力波速公式采用复化辛普森公式进行了改造。
