The fourth class is the test class: ServiceClassTest. (the nature of the implementations has been simplified as much as possible.)

第四个类是测试类：ServiceClassTest(实现的性质已经被尽可能地简化)。

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Fourth parts the school which was at by the author for the illustration emphatically to analyze in the teaching practice has practiced the green class to obtain the result and some ponders.

第四论以笔者所在的学校为例证着重分析了在教学实践中实践绿色课堂所取得成效和引发的一些思考。

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