It shows patterns of spontaneous activity that can change over time.

随着时间的改变它会出现一些自主活动模式。

In estimating the prospects of investment, we must have regard, therefore, to the nerves and hysteria and even the digestions and reactions to the weather of those upon whose spontaneous activity it largely depends.

因此，在估计投资前景时，我们必须考虑到那些自发活动在很大程度上取决于他们的神经和歇斯底里，甚至是对天气的消化和反应。