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。
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。
Aiming at the practice of traffic signal control in China, this paper analyzes the positive and negative effect of the commonly used traffic signal control designs.
针对我国城市道路交通信号控制中的灯色规定和一些常用信号正反两方面的影响因素等进行分析。
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