以下为句子列表：
英文: This Contract shall not be changed verbally, but only by a written instrument signed by the Parties.
中文: 本合同不得以口头方式修改，而须经双方签署书面文件后方可修改。
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英文: This Tenancy Agreement shall not be amended or otherwise modified except by a written instrument duly executed by the parties hereto.
中文: 本合同将不被修改或只在书面契约下由双方进行适当地修改。
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英文: When in doubt, the Ministry of Foreign Affairs, in conjunction with the Ministry of Justice and related competent authorities, shall decide whether an international written instrument signed by agencies of the central government, or their authorized insti
中文: 中央各机关或其授权之机构或团体，对于签订之国际书面协议系属协定或契约之性质发生疑义时，由外交部会同法务部及相关主管机关认定之。
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