So far, the rise in carbon dioxide seems to be fairly smooth over time, but the change in vegetation is jerkier.

到目前为止，似乎二氧化碳随着时间变化而增加的幅度相当平稳，但植被的变化却有更大的波动。

But it assumes that the probability of extreme price changes is negligible, when in reality, stock prices are much jerkier than this.

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。