Negative effect of practice has its existing reason and various forms different characteristics in different historical stages.
实践负效应有其存在的原因和不同的表现类型，在不同的历史阶段各有其不同特点。
World literary influence on Chinese literature in 20 century can approximately be divided into three different historical stages and formations.
世界文学对20世纪中国文学的影响，大致分为三个不同的历史阶段与历史形态。
The contemporary Chinese prose has been accepted and influenced outside too, there is different behavior in three different historical stages, there is outstanding reflection in four aspects.
现当代中国散文同样接受了外来影响，这种影响在三个不同的历史阶段有不同的表现，在四个方面有突出的反映。
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