宣告合同无效

【经】 avoidance of the contract

宣告的英语翻译：

declare; doom; sound; proclaim; pronounce; adjudgment; judgment
【法】 adjudicate; announcement; declaration; declare; notify; proclaim
proclamation; pronouncement; pronouncement of judgment
pronouncing a judgement

合同的英语翻译：

contract
【化】 contract; pact
【经】 compact; contract

无效的英语翻译：

be of no effect; invalidity; impotence; inefficacy; nullification; nullity
【计】 IDL; ineffectiveness
【医】 inefficacy
【经】 inefficiency; null and void