Intensity is a measure of powerperunit area, and even a laser that emits only a few milli-watts can produce a lot of intensity in a beam that's only a millimeter in diameter.
强度是每单位面积的度量，即使一个仅能产生几毫瓦能量的激光器也能产生一个直径只有一毫米的高强度光束。
2
A new conception of powerperunit impedance is defined and the basic equation to express the variation of load voltage magnitude with the variation of its dynamic equivalent impedance a.
定义了单位阻抗功率的新概念，推导了电压幅值随其等值阻抗和单位阻抗功率变化而变化的基本方程序。
3
But the conventional activated sludge process technology has some shortcomings: long water residence time, low processing powerperunit area, large area reactor, sludge bulking and so on.