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unless extended by mutual agreement本议定书自双方签字时起生效，有效期为8年，～。This Protocol shall enter into force upon signature by both Parties and remain in force for eight years,unless extended by mutual agreement.
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。