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❶without offspring; have no descendants❷never occur again虽不能说是～的，但至少可以说是空前的。Though we can’t say it will never happen again,it is at least unprecedented./空前～unprecedented and unrepeatable; never known before and never occur again;unique
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。