ex·tro·ver·sion /ˌɛkstrəˈvɚ/
  外向
  ex·tro·ver·sion /ˌɛkstrəˈvɝʒən, ʃən/ 名詞
  外翻
  ex·tro·ver·sion n.
  1. The condition of being turned wrong side out; as, extroversion of the bladder.
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  extroversion
       n : (psychology) an extroverted disposition; concern with what
           is outside the self [syn: extraversion] [ant: introversion,
            ambiversion]