n.每单位
Pressure is force per unit area. 压力就是电单位面积上的力。
The current is the charge flow per unit time. 电流是每单位时间流动的电荷。
Could you tell me the cost of production per unit? 请你告诉我每件成品的生产成本好吗？
The drag is a force per unit area of the layer. 拖力是流层单位面积的力。
By the charge density we mean the per unit volume. 所谓的电荷密度是指单位体积的电荷。
We must do everything to raise the per unit yield. 我们要千方百计提高单位面积产量。
