此项化验可用于诊断多种疾病。

The test is used to diagnose a variety of diseases.

《牛津词典》

她老是唠唠叨叨地诉说她患的多种疾病。

She's always going on about her various illnesses.

《新英汉大辞典》

立克次氏体是一种细菌，这种细菌可引起多种疾病，并通过吸血节肢寄生动物传播。

Rickettsia is a bacterium which can cause many diseases that are transmitted by blood-sucking parasitic arthropods.

youdao

Why is it difficult in some cases to produce a vaccine when we've been successful in so many others?

为什么某些疾病的疫苗很难研制,即使我们已经成功生产了很多种疫苗

耶鲁公开课 - 生物医学工程探索课程节选

So you hear about the Omega-3 fatty acids coming from seafood and these tend to be protective against diseases.

你们应该听过海鲜中提取的ω-3脂肪,这种脂肪能抵御多种疾病

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

There's a lecture I've given several times at hospitals, to doctors, on doing diagnosis of complex multi illnesses. And I go through it and almost the same kind of stuff I'm going to talk to you about, about debugging.

一个实验室内的实验，为什么实验不对呢？,我也在医院给医生关于,诊断复杂的多种疾病做过很多讲座,我想了想，那和我给你们讲的,关于调试其实都是一回事。

麻省理工公开课 - 计算机科学及编程导论课程节选