如果承包人切实履行并遵守上述合同的所有条款，本保证书所承担的义务即告无效。
If the Contractor shall duly perform and observe all the terms, provisions, conditions and stipulations of the said Contract, this obligation shall be null and void.
如果时间许可，打算宣告合同无效的一方当事人必须向另一方当事人发出合理的通知，使他可以对履行义务提供充分保证。
If time allows, the party intending to declare the contract avoided must give reasonable notice to the other party in order to permit him to provide adequate assurance of his performance.
译文：如果时间允许，欲宣告合同无效的一方当事人必须向另一方当事人发出合理的通知，使其可以对履行义务提供充分保证。
If time allows, the party intending to declare the contract avoided must give reasonable notice to the other party in order to permit him to provide adequate assurance of his performance.
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