x No Plagiarism!d470X2iueb5hga25odZZposted on PENANA 1,000,000粒沙子是一個丘,479Please respect copyright.PENANATTU6JxXMgO一個丘減掉一粒沙子還是一個丘 ,479Please respect copyright.PENANA9V2pgXSQuq假如一直重複這清況的話(每次都減掉一粒沙子),到了最後會是一個丘等於一粒沙子嗎? 172.70.130.150ns 172.70.130.150da2