The existing form to which a derivational affix can be added is called a stem .
能够加上一个派生词缀的原有语素叫做词干。
Morphology is divided into two sub-branches : inflectional morphology and lexical or derivational morphology .
形态学可分为两个分支科学：屈折形态学和词汇或派生形态学。
The derivational schematic diagram of design ideas .
图2设计理念的推导示意图。
An experimental study on the role of derivational affixes input in l2 learner s vocabulary acquisition .
派生词缀的输入在二语词汇习得中的实证研究。
As children produce sentences that more and more closely approximate the adult grammar , they begin to use functional words as well as inflectional and derivational morphemes of the language .
