这是一个现在看起来是未来的时代。这个时代和现在一定有些不同,其实看上去也没有什么分别。只不过在这个时代,地球上除了人类,已经没有其他的动物存在了。那些动物在很久以前就已经全部灭绝了,包括蚊子、苍蝇等等,人们已经成功地消灭了它们。你可以大概估算一下,以我们人类的智慧和行为,这个时代离你所在的现在并不遥远。在这个时代,动物园早已成为历史,因为已经 This is an era that now looks like the future. There must be some differences between this era and the present, in fact, there seems no difference. Only in this era, there are no other animals on Earth except humans. Those animals were completely extinct a long time ago, including mosquitoes, flies and so on, and people have succeeded in annihilating them. You can probably estimate that with our human wisdom and behavior, this era is not far away from where you are. In this era, the zoo has long been history, because already