(used to refer to a person, thing, mentioned previously)(指说话人与听者已知的人〔物〕)(used when what is discussed is obvious)(用于独一无二的事物前)(used before a unique thing)(与形容词最高级和序数词连用)(used with super and ordinal word)(在单数名词前表示一类人〔物〕)(used with a singular noun to refer to a whole class)(用于江河、山脉等名称之前)