資料來源 : pyDict

有用地

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Usefully \Use"ful*ly\, adv.
   In a useful manner.

資料來源 : WordNet®

usefully
     adv : in a useful manner; "extra money could be usefully spent on
           this project" [ant: {uselessly}]