In our case, each state consists of transitions and optionally levels
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广东联盟集采将生长激素纳入目录，金赛药业的核心产品水针剂若中标，降价幅度可能高达 70%。
1.解析 html 页面，生成一个包含节点位置信息，样式，层级，内容等信息的 DOM 树。
，这一点在同城约会中也有详细论述
In the 1950s, legendary behaviorist B.F. Skinner debuted his version of a “teaching machine,” based on the 1924 invention of Ohio State University psychology professor Sidney Pressey. The contraption was loaded with a piece of paper with questions, and students pressed keys indicating the correct answer, at which point another question would appear. Both Pressey and Skinner ran into similar problems, though, failing to implement the technology in schools. Educators weren’t convinced of the machine’s benefit, which prioritized individually paced learning not conducive to students of the same age moving through a grade level at the same time.
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