其中最重要的方法有三种：事件案例分析法、自然实验法和准试验法。
In all the researching methods, the three kinds is the most important, that is events and cases analyzing method, natural experiment method and semi-experiment method.
其中最重要的方法有三种：事件案例分析法、自然实验法和准试验法。
In all the researching methods, the three kinds is the most important, that is events and cases analyzing method, natural experiment method and semi-experiment method.
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