self-in·ter·est /-ˈɪnt(ə)rəst; ˈɪntəˌrɛst, ˌtrɛst; ˈɪntɚ/
  利己主義,私利
  Self-in·ter·est n. Private interest; the interest or advantage of one's self.
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  self-interest
       n 1: taking advantage of opportunities without regard for the
            consequences for others [syn: opportunism, self-seeking,
             expedience]
       2: attempting to get personal recognition for yourself
          (especially by unacceptable means) [syn: egoism, egocentrism,
           self-concern, self-centeredness] [ant: altruism]