Reduce

（1）弱化

（2）缩减

（3）缩减

(1) A term used in the phonological classification of vowel sounds, referring to a vowel which can be analysed as a centralized variant of a vowel in a related form.

(2) A future phonological use of the term is found in the context of phonological rules, where it refers to a process of simplification which affects certain types of sound sequence. The most important category is consonant-cluster reduction.

(3) In grammar, the term usually refers to a clause which lacks one or more of the elements required to enable it to be used as a full, independent construction. Such clauses may be referred to as ‘abbreviated’, elliptical, or contracted; but different approaches often introduce distinctions between these terms. Other units are sometimes referred to as ‘reduced’, such as phrases and words.

（1）音系学给元音分类的术语，指一个元音可分析为一个相关形式的元音的央化变体。

（2）音系学用于跟音系规则有关的说明，指影响某些类型的语音序列的简化过程。最重要的一类缩减是辅音丛缩减。

（3）语法术语，通常指一类小句缺乏一个或几个成分，因此不能用作完整的、独立的构式。这类小句也可称作“缩略句”、省略句或缩约句，但不同的理论往往以不同方式区别使用这些术语。其他单位有时也用“缩减”称之，如缩减短语和缩减词。