Socio-linguistics is an interdisciplinary subject, which came into existence in the mid-1960s. It focuses on various linguistic differences and various social factors resulting in these differences.
社会语言学是上世纪60年代中期兴起的一门边缘学科，研究各种语言差异和造成差异的各种社会因素。
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As for guiding translation theory, Functional Equivalence of Semantics or Pragmatics, Linguistic or Cultural Adaptation and Socio-semiotic Approach etc.