A morpheme is the minimal distinctive grammatical unit, and is the lowest unit grammatical hierarchy.
词素是最小的辨别语法单元，也是语法层次中最低级的单元。
Morpheme is the smallest unit in terms of the relationship between expressions and content, a unit that cannot be divided without destroying the meaning, whether it is lexical or grammatical.
语素既是英语中音义结合的最小单位，又是语法分析的最小单位。
An element that indicates grammatical class or function; a derivational or inflectional morpheme.
标记表示语法种类或功能的成分；
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