adj.重复的，冗余的的，赘述的
Merriam-Webster Online Dictionary
redundant (adjective)1.
a) what is necessary or normal - exceeding superfluous
b) characterized by or containing an - excess , specifically using more words than necessary
c) characterized by similarity or repetition - a group of particularly redundant brick buildings
d) chiefly British no longer needed for a job and hence laid off
2.
- profuse lavish
3.
serving as a duplicate for preventing failure of an entire system (as a spacecraft) upon failure of a single - component
Merriam-Webster Online Thesaurus
redundant (adjective)being over what is needed
SYNONYMS:
excess, extra, redundant, supererogatory, superfluous, supernumerary, surplusRELATED WORDS:
accessory, additional, supplemental, supplementary; de trop, dispensable, extraneous, gratuitous, needless, nonessential, uncalled-for, unessential, unnecessary, unneeded, unwanted; abundant, ample, bountiful, copious, plenteous, plentifulNEAR ANTONYMS:
deficient, inadequate, insufficient, meager ( meagre), niggardly, poor, scant, scanty, scarce, short, shortish, skimpy, sparse