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No addition or modification to this contract shall be valid unless made in writing.
除非以书面形式做成，对本合同所进行的补充和修改均无效。
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The change could be a modification, addition, or deletion.
这种更改可能一处变更、添加或者删除。
youdao
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The change could be a modification, addition, or deletion.
这种更改可能一处变更、添加或者删除。
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