con·ver·sance /kənˈvɝsṇ(t)s ||ˈkɑnvɚ/
  熟悉,精通
  Con·ver·sance n. The state or quality of being conversant; habit of familiarity; familiar acquaintance; intimacy. [R.]
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  conversance
       n : personal knowledge or information about someone or something
           [syn: acquaintance, familiarity, conversancy]