本翕合同只能按照双方授权代表签名盖章的文件进行修改或增补；
This Contract can only be altered, amended or supplemented in accordance with documents signed and sealed by authorized representatives of both parties.
本合同的修改补充应按双方授权代表签名盖章的文件，才能进行。
This Contract can only be altered, amended or supplemented in accordance with documents signed and sealed by authorized representatives of both parties.
您的电子或纸质签名，或者授权代表您行为的权利人的电子或纸质签名。
Your electronic or physical signature or the electronic or physical signature of the person authorized to act on your behalf.
各方授权代表附上签名如下，以兹证明。
IN WITNESS WHEREOF, the duly authorized representatives of the Parties affix their signature below.
各方授权代表附上签名如下，以兹证明。
IN WITNESS WHEREOF, the duly authorized representatives of the Parties affix their signature below.
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