因此有着季节性的波动。
因此有着季节性的波动。当雪天来临时，就业机会就会消失。
So have seasonal fluctuations. Jobs used to disappear when the snow fell.
相反，诸如季节性温度变化等高频波动是可以观察到的，而且在某种程度上是可以预测的，因此群体可以相应地调整它们的行为。
In contrast, high-frequency fluctuations such as seasonal temperature variations are observable and somewhat predictable, so that groups could have adapted their behaviors accordingly.
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