Something that is redundant is unnecessary, for example, because it is no longer needed or because its job is being done by something else.
双语例句
例： Changes in technology may mean that once-valued skills are now redundant.
技术的革新可能意味着那些从前被看重的技术如今却显得多余了。
例： the conversion of redundant buildings to residential use.
将空置建筑改造为住宅。