7 年前
视频简介
Kenan's principal calls home and tells Kenan that she wants to have a meeting with him and his parents, so he finds some new ones.。穿越人类历史的长河，重新经历头脑的风暴，讲述6个改变了世界的标志性发明创造。生产力是如何改变人类生活的，人类的创造力又是如何影响世界的。。
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