Once a contract is signed, it has legal effect. Both parties have the obligation to fulfill the signed contract.

合同一旦签订，便具有法律效力。双方均有义务去履行已签订的合约。

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The squirrel answered, "I only fulfill my obligation to build up a reserve fund.

松鼠回答："我只是履行自己的职责来建立后备基金。

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Article 7 All organizations and individuals shall fulfill their obligation to conserve energy and have the right to report against any waste of energy.

第七条 任何单位和个人都应当履行节能义务，有权检举浪费能源的行为。

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As Jill has declared many times as Second Lady, helping to muster the strength and to remind the neighbors that everyone in America has a duty to fulfill that sacred obligation I mentioned.

WHITEHOUSE: Joining Forces to Support Military Families

Lee and Bain Capital Partners, were prepared to fulfill their obligation to fund and close the Clear Channel (nyse: CCU - news - people ) deal, but some issues were still being worked out.

FORBES: Clear Channel Deal Fading

And third, recognizing our community, our common obligations to preserve and strengthen our families, to do our duty to our parents, to fulfill our obligation to give our children the best future possible, with good schools and good health care and safe streets and a clean environment.

CNN: Transcript of President Clinton's weekly radio address