VERB
废除，取消（合同等）；宣告（选举等）无效
If an election or a contract is annulled, it is declared invalid, so that legally it is considered never to have existed.
例句
Opposition party leaders are now pressing for the entire election to be annulled...
反对党领导人现正强烈要求宣告这次选举无效。
The marriage was annulled last month.
上个月这桩婚姻被宣告无效。