一個丘減掉一粒沙子還是一個丘 ,669Please respect copyright.PENANAEKIAiS3JMn
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?ns216.73.216.124da2
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