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。
In modern society, owning to the emergence of practice negative effect, human beings begins to think practical rationality problems.
在现代社会源于实践负效应的出现，人类开始思考实践的合理性问题。
However, there exist many problems in the current situation of geographical-teaching practice, which exerts a negative effect on talent-training purpose in geographical education.
但地理教学实习的现状却存在很多问题，影响着地理教育人才培养目标的实现。
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