资料来源 : pyDict

不断地;永久地

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

Perennially \Per*en"ni*al*ly\, adv.
   In a perennial manner.

资料来源 : WordNet®

perennially
     adv : in a perennial manner; repeatedly; "We want to know what is
           perennially new about the world"