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第四回推动地球不费吹灰力横扫劲敌方知科学威———杠杆原理的发现科数理化通俗演义(5)@梁衡@鲁青$黏土馆子工作室
The fourth time to promote the earth is no effort to sweep across the enemy to know science and technology - the discovery of the principle of leverage physics and chemistry popular romance (5) @ Liang Heng @ @ green blue clay studio studio