?或者在自然发生
或者在自然发生（spontaneous generations）中表现为万物的种，或者是在岩石中表 现为化石。
The boomers have a lot to learn from the more tech-savvy and spontaneous Millennial and Gen-X generations, Furlong says.
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英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。