familiarity n.熟悉, 通晓, 亲密, 熟悉, 精通英英解释:名词familiarity:1. personal knowledge or information about someone or something同义词：acquaintance, conversance, conversancy2. usualness by virtue of being familiar or well known3. close or warm friendship同义词：intimacy, closeness4. a casual manner同义词：casualness5. an act of undue intimacy同义词：impropriety, indecorum, liberty
