1990年代至2000年代中期，相關指標曾一路上行。
the point i want to get to with Thompson’s paper is that the last few sentences of Thompson’s original paper actually mention the possibility of intersection and complement (below), but the funny thing is that this footnote has been forgotten for decades, and no one ever followed through.. and for the ones who tried, in fact, it wasn’t so easy in Thompson’s NFA framework at all, the devil is in the details.
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第三重考验，是生态的持续运营。