Prices fluctuate, in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available.

价格会随着收成、自然灾害和政治不稳定而波动；当价格上涨时，需要一段时间才能找到新的供应来源。

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Natural vibration and dynamic response on time dependent structure are analyzed, the equations of natural vibration and dynamic response are set up.

研究了时变结构的自振特性和动力反应，建立了随机时变结构的自振和动力反应方程。

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Airborne remote sensing technical system (ARSTS) possesses flexible and fast response ability. It plays an important part in real time and dynamically monitoring natural disasters.

航空遥感技术系统具有机动灵活和快速反应能力，在灾害的实时动态监测中发挥重要作用。

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But at the time my response felt perfectly natural.

FORBES: A Simple Communication Mistake to Avoid

Simmons says it's already clear that people will spend more time with a robot that has this kind of natural response.

NPR: Robot Receptionist Dishes Directions and Attitude