《我爱发明》创新乐不停4 自动砌墙机 解决人工砌墙时费时费力问题 20180918 | CCTV科教

《我爱发明》创新乐不停4 自动砌墙机 解决人工砌墙时费时费力问题 20180918 | CCTV科教

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