You take the flux, multiply it by the cross section, average it, integrate it over the whole volume.
你拿流量乘以横截面，平均它，乘以它除以总容积。
Algal growth rate is different with average velocity, water depth and cross-section width.
藻类的生长速度因各断面的流速、水深和水面宽的不同而不同。
Moreover, the average collision cross-section between a slow electron and a neutral particle is measured at several different temperatures using both the interferometer and the transmission methods.
本文将条纹干涉仪与透射仪联合使用，测定了在某些温度下慢电子与中性粒子的平均碰撞截面。
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