它使尼古丁缓慢、稳步地扩散到血液当中。

It allows nicotine to diffuse slowly and steadily into the bloodstream.

《柯林斯英汉双解大词典》

小麦锈病惊人的扩散速度使快速的遏制措施难以实现。

The astonishing spread of wheat rust makes quick containment impossible.

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这些破坏使健康细胞长成异常的肿块或肿瘤，扩散至全身，扰乱正常的生理过程，如不加以遏止，最终将导致死亡。

This damage causes them to grow into abnormal lumps or tumours and spread around the body disrupting its normal processes and eventually--if unchecked--causing death.

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Diffusion mixes things very well, but as the size gets bigger, diffusion becomes very slow.

扩散作用使物质充分混合,但随着细胞变大后,扩散作用就捉襟见肘了

耶鲁公开课 - 生物医学工程探索课程节选

So controlling the dose is really important and that's going to turn out to be very important in cancer therapy because these are very potent drugs that will have bad effects in other sites and you want to localize them where they want, so we're going to talk about that.

控制药物剂量非常重要,特别是在癌症的治疗当中,这一点尤为重要,因为这些药物效力强大,会对其他部位产生不良影响,你不能使药物扩散到别的组织,这就是我们要讲的问题了

耶鲁公开课 - 生物医学工程探索课程节选