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on and off谈判～。The negotiations went on and off./～的枪声on-and-off gunshot
一会儿断了，一会儿又继续下去。形容断断续续。on and off, by fits and starts
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。