逐渐变宽 meaning in English

progressive widening

In the following milling stage , the particle size gradually reduced and the particle size distribution became wider , which is in accordance with r - r - b ( rosin - rammler - bennet ) equation and can be described by " surface " pulverizing mechanism
随后的粉碎过程则表现为：粒度逐渐减小，粒度分布逐渐变宽，可用r - r - b ( rosin - rammler - bennet )方程描述，属典型的表面粉碎机理。