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so do you deliver your own mail? or do you have your own mail person? but then who delivers his mail? is there a never-ending chain of mailmen delivering mail to other mailmen?
所以你投递你自己的信件吗？还是你有你自己的邮递员？但那么谁投递他的信件？是否存在一个绵延不绝的邮递员链条向其他邮递员投递信件？
top 10 questions scientists still can't answer to this day
科学家至今仍无法回答的十大问题
