0 a sticky substance that is used for joining things together permanently, produced from animal bones and skins or by a chemical process -- 胶;胶水
1 to join things together using glue -- 用胶粘
a blob of glue
The sum operator has the effect of gluing together two modules - see rule (m-sum).
Each presentation of a surface can be reduced to a singleton by inverse and gluing operations since a surface is connected.
No prefix gluing in the cycle can involve a reduction in alphabet.