If required, Party a shall notify Part B in writing for the modification on the manuscript during the process of translation.

如甲方在翻译过程中对原稿进行修改，须书面通知乙方。

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But sources say Unison could only join the action if it were part of a "legitimate trade dispute", and point out that it would need to notify more than 20, 000 employers.

BBC: Unite trade union calls for general strike