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 .

随着儿童的语言越来越接近成人语法，他们开始使用其语言中的屈折因素、派生词素和功能词。