- 问题详情:Eachyear,about10,000to100,000animalspeciesdieoff.Theyjointhecountlessspeciesthathavegoneextinct(灭绝)overthecourseofEarth'shistory-andextinctionmeansforever.Atleastitusedto.Scientistsarenowclosinginontheabilitytobringbackextinctspecies.No,th...
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