Language change from region to region, from social group to another, from individual to individual.
Language varieties are related to region, social ass, educational background, and the degree of formality of a situation in which language is used, including standard language, dialects, registers, pidgins, creoles, etc.
Horizontal bilingualism (横向性双语现 象) & diagonal bilingualism (倾斜性 双语现象)
Multilingualism
A situation where 3 or more languages are used by an individual or by a group of speakers.
Chapter 8 Sociolinguistics
Language is a city to the building of which every human being brought a stone. ——Ralph Waldo Emerson
Once you open your mouth, you are placed. —— Pygmalion by Bernard Shaw
The origin of the name
➢ -- Hebrew pidjom meaning “trade or exchange” -- Chinese characters pei and ts'in meaning “paying money”