A small volume of fluid, often of a higher density than the main body of fluid, within the circulating or production-fluid system that influences the flow or production characteristics of the well.
在循环系统或产出流体系统内部的小体积流体，其密度通常高于主体流体，其作用是影响井的流动特性或生产特性。
Poisonous and harmful smoke flow with a certain volume, temperature, concentration and density will be generated during explosion in a coal mine.
当煤矿井下发生爆炸时会产生一定体积、温度、浓度及密度的毒害烟流。
Initially set velocity, density of traffic flow, traffic volume of service and the rate of traffic load as the measurement indicators.
对航道服务水平进行定义，并初步确定速度、交通流密度、服务交通量和交通量负荷比等四项度量指标。
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