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。
In any systems, it is quite natural to expect some response within a specific time interval.
在任何系统,这是很自然的期望某种回应在一个具体的时间间隔。
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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