whip·per·snap·per /ˈhwɪpɚ/
  傲慢的家夥,不重要的人
  Whip·per·snap·per n. A diminutive, insignificant, or presumptuous person.  [Colloq.] “Little whippersnappers like you.”
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  whippersnapper
       n : someone who is unimportant but cheeky and presumptuous [syn:
            jackanapes, lightweight]