The people's court or arbitration institution shall change or rescind the contract based on the actual circumstances of the case, in accordance with the principle of fairness. 人民法院或者仲裁机构应当结合案件的实际情况，根据公平原则变更或者解除合同。 Where a party uses a contract to compromise the national interest or public interest, the market regulation and other relevant administrative departments shall be responsible for supervision and disposition in accordance with the laws and administrative regulations. 对当事人利用合同实施危害国家利益、社会公共利益行为的，市场监督管理和其他有关行政主管部门依照法律、行政法规的规定负责监督处理。 Where an agreement by the parties is ambiguous regarding the contents of modification, the contract shall be presumed not modified. 当事人对合同变更的内容约定不明确的，推定为未变更。