资料来源 : pyDict

费力地;艰辛地

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Arduously \Ar"du*ous*ly\, adv.
   In an arduous manner; with difficulty or laboriousness.

资料来源 : WordNet®

arduously
     adv : in an arduous manner; "they worked arduously"