但是这一模型假设极端价格波动的概率是可忽略的，而在现实当中，股票价格的剧烈波动远比假设的情形要频繁。
But it assumes that the probability of extreme price changes is negligible, when in reality, stock prices are much jerkier than this.
市场价格频繁的小涨小跌，但整体水平没有太大变化，这种波动通常是由投机性的行为引起的。
The market price goes small ups and downs frequently while there is no big overall changes. Such fluctuations of prices is often caused by speculation.
摘要：股票价格频繁的波动是股票市场最明显的特征之一。
Abstract: the frequent fluctuation of the stock price is one of the most obvious characteristics of the stock market.
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