failure of performance of a contract
不履行合同
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Oh, a breach of contract is one party's failure to perform the contract or its performance of the contractual obligations does not conform to the agreed terms.
噢，违约就是一方当事人不履行合同或者履行合同义务不符合约定条件。
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