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怎么通俗地理解张量？ - 知乎 Dan Fleisch是《A Student’s Guide to Vectors and Tensors》的作者，他发现很大一部分读者都有一个疑问：到底张量是TMD什么东西? (What’s a tensor? ） 于是乎就做了这个视频，用12分钟来告诉你张量是什么。
如何评价中央情报局（CIA）的武装力量？ - 知乎 Tucker Gougelmann - Gougelmann was a Paramilitary Operations Officer from the CIA's Special Activities Division who worked in the CIA from 1949 to 1972, serving in Europe, Afghanistan, Korea, and Vietnam Gougelmann returned to Saigon in spring 1975 in an attempt to secure exit visas for loved ones after North Vietnam had launched a major