动词短语
中文翻译：变得无效
同义词：
['become null', 'become void', 'become invalid']
例句：
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1. The contract became null after the agreement was broken.
合同在协议被破坏后变得无效。
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2. The document has been made void by the court's decision.
法院的决定使这份文件无效。
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3. The law is invalid because it violates human rights.
法律因侵犯人权而无效。