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注意这个黑板不是滑动的。。。。

貌似出自这里，IMDb, Douban

This particular scene he is supposed to be proving the Heisenberg Uncertainty Principle to which he adds in the end, "It proves we can't ever really know... what's going on. So it shouldn't bother you. Not being able to figure anything out. Although you will be responsible for this on the mid-term. "

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