治疗目标是降低艾滋病毒水平，以帮助免疫系统的自我更新，并保持人民较长的健康，部分原因也是为了阻止病毒扩散。

The goal of treatment is to lower HIV levels to help the immune system renew itself and keep people healthier longer, in part to stem the spread of the virus.

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因此，强化固液间的分子扩散和界面更新是提高树脂催化蔗糖溶液水解速率的途径。

So, enhance the molecule diffusion and the interphaserenovation is the way to increase the rate of hydrolysis.

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给出了更新过程的一种扩散逼近。

We first derive a diffusion-type approximation of renewal processes.

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