strike risk的意思|示意

Virgin-soil epidemics are those in which the populations at risk have had no previous contact with the diseases that strike them and are therefore immunologically almost defenseless.

处女地流行病指的是那些风险人群以前没有接触过袭击他们的疾病，因此在免疫上几乎毫无防御能力的疾病。

Having long been the most accessible river crossing between Nevada and Arizona, the dam is thought to be at risk of a terror strike, with trucks already banned from crossing.

胡佛大坝长期作为内华达州和亚利桑那州主要的交通连接处，虽然卡车已经禁止通行，但是大坝依然面临恐怖袭击的威胁。

It also is increasingly used to weed out embryos at risk of genetic diseases — such as breast cancer — that could be treated, or that might not strike a person later in life.

因为存在有某些基因疾病——例如乳腺癌——的风险而被流产的胎儿也越来越多，而这些疾病是可以被治愈的，或者这些疾病也许根本不会发生。