- 问题详情:Oneofmyfirstmemoriesasachildinthe1950swasadiscussionIhadwithmybrotherinourtinybedroominthefamilyhouseinBethlehem,Pennsylvania.WehadheardinschoolaboutaplanetcalledPluto.Itwasthefarthest,coldest,anddarkestthingachildcouldimagine.Weguessedhowlon...
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