资料来源 : pyDict

逆行,后退,倒退

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

Retrogradation \Re`tro*gra*da"tion\, n. [F. r['e]trogradation or
   L. retrogradatio. See {Retrograde}.]
   1. The act of retrograding, or moving backward.

   2. The state of being retrograde; decline.