The results indicate that besides free volume, flexibility of the Wham plays an important role in influencing the rate of physical ageing.
结果表明，除了自由体积之外，分子链柔顺性是影响物理老化速率的重要因素。
Ageing in this case must occur according to the laws of physical chemistry and of thermodynamics.
在这种情况下，老化必须根据物理化学和热力学定律进行。
In many countries the physical infrastructure is ageing, health-care costs are exploding and money is tight.
在许多国家，基础设施开始老化，医疗保健费用暴涨，而且手头越来越紧。
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