He had read about exotic diseases, kidnapping, plane crashes, and all kinds of other incidents that would make it too dangerous to go.

他读过关于异国疾病、绑架、飞机失事和各种其他事件，这些事件会使去那里太危险。

There are thousands of apps available on our smartphones that can offer first aid advice and allow us to self-diagnose our ailments – ranging from a simple cold or flu to some exotic disease such as dengue fever.

我们的智能手机上有数以千计的应用程序可以提供急救建议，并让我们能够自我诊断自己的疾病——从简单的感冒或流感到一些外来疾病，如登革热。