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。
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。
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