The probability that healthy people will develop a disease during a specified period of time (that is, the number of new cases of a disease in a population over a period of time).

也就是说，在一段时间内人群中新出现病例的数目。

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He said that describing aging as a disease creates incentives to develop treatments.

他说，将衰老描述成疾病，会促使人们寻找衰老的治疗方法。

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Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye.

感染疱疹病毒的老鼠一般会患上角膜炎，这是一种影响部分眼睛的变性疾病。

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Most of them, at some point, will develop a chronic disease or disability.

FORBES: Aging Outside the Nuclear Family

Mice that have been genetically engineered to have a predisposition to the disease develop a motor impairment which prevents them turning when they are walking along a pole.

BBC: Lifestyle link to Huntington's disease

Women today generally develop cardiovascular disease a decade or so later than men.

WSJ: Telltale Finding on Heart Disease in Mummies