Spreading

（1）展唇

（2）展连

（3）展连

(1) A term in the classification of lip position in phonetics, referring to the visual appearance of the lips when they are held fairly close together and stretched sideways, as in a slightly open smile. Spread lips are noticeable in close vowels, as in the [i] of see, and contrast with neutral, open and rounded lip positions.

(2) In some models of non-linear phonology, spreading refers to the association (or linking) of a feature or node belonging to one segment with an adjacent segment; the disassociation of a feature or node from a segment is called delinking. The notion is of particular importance in the study of assimilation, where the effect of spreading produces an output representation with multilinked nodes, and dissimilation, where a feature or node is delinked from a segment, and the orphaned node is later deleted.

(3) In autosegmental phonology, spreading refers to a type of rule which extends the association of a tone in a given direction. Spreading is indicated by an arrow in the autosegmental rule, pointing to the right for unbounded rightward spreading, and to the left for unbounded leftward spreading.

（1）语音学给唇位分类的术语，指双唇看上去挨得很近并向两边展开，如开口微笑时的姿势。展唇常见于闭元音，如see“看见”中的[i]，与中性唇位、开唇和圆唇对立。

（2）某些非线性音系学模型术语，指一个属于某一个音段的特征或节点与一个邻接音段相联接（或连系）；一个特征或节点与一个音段取消联接叫做断连。同化是展连的结果得出的表征式含有多重连系节点，异化是一个特征或节点与一个音段断连，孤立的音段随后被删除。

（3）自主音段音系学术语，指一类规则将一个声调的联接朝一定方向扩展。展连在自主音段规则中用一个箭头表示，右向箭头表示不受限的右向展连，左向箭头表示不受限的左向展连。