先履行一方履行债务不符合约定的，后履行一方有权拒绝其相应的履行要求。
If the other party rendered non-conforming performance, one party is entitled to reject its corresponding requirement for performance.
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。
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.
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