For these and other reasons, it is difficult to establish the exact number of people affected by the disease and the size and location of all endemic areas.

鉴于这些以及其它原因，要确定受该病感染的人数以及所有流行地区的规模和地点是困难的。

youdao

Of former smokers, 40.6% quit because of illness, 26.9% to prevent disease and 10.9% for financial reasons.

在所有的曾经吸烟者中，40.6%戒烟是因为疾病，26.9%是为了预防疾病，而10.9%则是因为经济原因。

youdao

Advances in medicine, which may help people with the disease live longer, and better detection of diabetes are other reasons why its prevalence could dramatically increase by 2050, she said.

她说，使患者存活时间更长的医疗技术进步和更有效的检察手段也是导致预测2050年左右糖尿病病例会大幅增加的因素之一。

youdao

The curious life cycle of the parasite, called plasmodium, is one of the reasons why the disease has proved so difficult to control.

BBC: Venom to arm mosquito against malaria

The goal of the U.S. vaccination program should be to eliminate meningococcal disease, and the preferred strategy to eliminate the disease would include infant immunization, even though for reasons that are unknown the incidence of the disease has declined in recent years.

FORBES: Immunizing Bureaucrats Against Complacency

Cancer is a very lonely disease and one of the reasons why it feels lonely, seems lonely, is this axiomatic belief that it's not transmissible.

NPR: Startling New Evidence Cancer Is Contagious