cover of episode 001："2B"铅笔的秘密

001："2B"铅笔的秘密

Publish Date: 2014/3/28

原来是这样 Dscience

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Shownotes Transcript

大大小小的考试都得用2B铅笔！难道这是衰落的铅笔工厂与教育部门间不可告人的秘密？！