Analyzed by an example, it is shown that the parameters of stress, strain, porosity and permeability change with time and space.
示例分析说明，本模型可用于研究应力、应变、孔隙度和渗透率的动态变化规律以及可能对生产造成的影响。
Through analysis of concentration change with time and space of mian air pollutants, some causes of the change regularity are expounded, being useful for pollution forecasting and control.
通过分析大气中主要污染物浓度的时空变化，阐明形成此规律的原因，对大气污染物的预测和防治具有一定意义。
When flying on orbit, with the change of environment and time, the response capability of a space camera must be attenuated.
空间相机在轨运行之后，由于环境的变化和时间的推移，空间相机的响应性能必然会发生衰减。
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