14. A computer system, comprising: one or more processors; and memory having instructions stored thereon, which when executed by the one or more processors cause the processors to perform operations, the operations including: integrating a first vocabulary list and a second vocabulary list that are built based on a first language and a second language, respectively, into a comprehensive vocabulary list, wherein the integrating includes analyzing the first vocabulary list in view of the second vocabulary list to at least identify a first vocabulary sub-list, in the comprehensive vocabulary list, that is used in the first language, but not in the second language; identifying, within the information content, a plurality of expressions that are included in the comprehensive vocabulary list; identifying, within the plurality of expressions, a subset of expressions that are included in the first vocabulary sub-list; determining that a total frequency of occurrence of the subset of expressions within the information content meets predetermined occurrence criteria; and in accordance with the determination, determining that the information content is composed in the first language.
14. A computer system, comprising: one or more processors; and memory having instructions stored thereon, which when executed by the one or more processors cause the processors to perform operations, the operations including: integrating a first vocabulary list and a second vocabulary list that are built based on a first language and a second language, respectively, into a comprehensive vocabulary list, wherein the integrating includes analyzing the first vocabulary list in view of the second vocabulary list to at least identify a first vocabulary sub-list, in the comprehensive vocabulary list, that is used in the first language, but not in the second language; identifying, within the information content, a plurality of expressions that are included in the comprehensive vocabulary list; identifying, within the plurality of expressions, a subset of expressions that are included in the first vocabulary sub-list; determining that a total frequency of occurrence of the subset of expressions within the information content meets predetermined occurrence criteria; and in accordance with the determination, determining that the information content is composed in the first language. 17. The computer system of claim 14 , wherein the first and second languages are two distinct Chinese dialects, and wherein identifying the plurality of expressions, within the information content, that are included in the comprehensive vocabulary list, further comprises: segmenting the information content to the plurality of expressions in accordance with the comprehensive vocabulary list.