复习资料（3.1）
Definition定义
Morphology is a branch of grammar which studies the internal structure of words and the rules by which words are formed.
形态学是语法的一个分支，研究词的内部结构和构词规则。
Morphology is divided into two sub-branches: inflectional morphology and lexical or derivational morphology. The former studies the inflections and the latter is the study of word formation.
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。前者研究词的屈折变化，后者研究词的构成。
1、Morpheme 语素
The smallest meaningful unit of language语言最小的意义单位。
The meaning morphemes convey may be of two kinds: lexical meaning and grammatical meaning.
语素表达的意义有两种：词汇意义和语法意义。