工人们进行抗议，反对拟议中的对他们合同的修改。
The workers staged a protest against the proposed changes in their contracts.
5除非书面约定或证明，任何对合同的修改都是无效的。
No modification of the Contract is valid unless agreed or evidenced in writing.
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.
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