这是出生率与死亡率平衡的问题。

That's to do with the balance of birth and death rates.

youdao

这项研究发表在《发病率与死亡率周报》上。

The study appears in the journal Morbidity and Mortality Weekly Report.

youdao

胆瘘的外科处理有着很高的发病率与死亡率。

Surgical management of biliary fistulas is associated with high morbidity and mortality.

youdao

What makes it so much better to be alive now in terms of your likelihood to die of an infectious disease than it did in London in 1665?

是什么让生活变得更好呢,从传染病死亡率的角度来讲,与1665年的伦敦相比

耶鲁公开课 - 生物医学工程探索课程节选