group
名词 group:
any number of entities (members) considered as a unit
同义词:grouping
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
同义词:radical, chemical group
a set that is closed, associative, has an identity element and every element has an inverse
动词 group:
arrange into a group or groups
form a group or group together
同义词:aggroup