求翻译：如乙方遭遇迫不得已必须更换项目负责人及研发团队人员的情形，应提前15个工作日通知甲方，且必须经甲方书面同意，是什么意思？

B suffered a compelling case of project leader and research and development team must be replaced, shall give 15 days notice to the Party, and must be approved by the written consent,

If Party B must be replaced with no compelling project leaders and research and development team members must be made in advance of the situation, 15 business days notice, a party must be approved by and agreed to in writing,

If the second party bitter experience has no recourse must replace the project person in charge and the research and development team personnel's situation, should ahead of time 15 working day notice the party of the first part, also must pass through the the party of the first part written agreemen

If str encountered compelling project leader and research team members ' individual situations must be replaced, should be 15 working days advance notice to the customers, and must be approved by written consent of the owner,

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