1. The contract was nulled because of a breach of agreement. - 由于违反协议，合同被作废了。
2. The warranty was nulled when the product was tampered with. - 当产品被篡改时，保修作废了。
3. The judge nulled the marriage after evidence of fraud was presented. - 法官在出示欺诈证据后，宣布婚姻作废。
4. The software license was nulled when the terms of use were violated. - 当使用条款被违反时，软件许可证作废了。
5. The decision to null the contract was made after careful consideration. - 经过慎重考虑，决定作废合同。
6. The vote to null the election results was met with strong opposition. - 作废选举结果的投票遭到了强烈反对。