size fractionation的用法和樣例：
例句
- A step in the right direction, Wenzel says, would be defining the vehicle classes by size rather than weight.
溫契爾表示，正確的方嚮應該是依據體積而非重量訂定汽車分級。 - In order to evaluate the classification efficiency of a classifier, this paper introduces the concepts of classification cut size and collection cut size.
為了評價分級機的分級效果，本文引入了分級粒徑和收集粒徑的概念。
