Any fluctuations in food supply (either positive, for example, due to technology improvements, or negative, due to droughts and pest invasions) tend to translate directly into population fluctuations.
粮食供应的任何波动(例如，由于技术进步而出现的正面波动，或者由于干旱和害虫入侵而出现的负面波动)都倾向于直接转化为种群的波动。