There is a problem of shortage of quality supply in monopolistic markets because monopolists have market power.
由于垄断者具有市场力量，垄断市场存在质量供给不足的问题。
The single educational mode and the shortage of appeal and fascinating power have a strong influence on education all the time.
教育模式单一，感染力和吸引力不足一直以来影响教育的效果。
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