On the other hand, some knowledge can be obtained only through experience.
另一方面，一些知识只能通过经验获得。
During four-years experimental teaching, Ningbo TV University has accumulated experience, obtained achievements, but also met with some problems.
宁波电大通过四届会计学本科学员的会计模拟实验教学，积累了经验，取得了显著成绩，也发现了一些问题。
Last, from the perspective of formation plugging induced by injecting HPAM, the paper obtained optimal principles of some injection parameters by derivation applied the existing experience.
最后从注入HPAM造成地层堵塞的角度出发，应用已有的经验进行反推，导出了部分注入参数的优选原则。
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