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。
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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