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。

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Then this obligation shall be null and void, but otherwise it shall be and remain in full force and effect.

届时，本承包书所承担之义务即告终止和失效。否则仍保持完整有效。

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Then this obligation shall be null and void, but otherwise it shall be and remain in full force and effect.

届时，本承包书所承担之义务即告终止和失效。否则仍保持完整有效。

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