high-risk group的用法和樣例：
例句
- Haing unusual moles, exposure to sunlight and being fair-skinned are thought to place people at higher risk.
具有較大的痣，接受陽(yáng)光暴曬和較淺膚色者被認為是皮膚癌的高危人群。 - The floating population is both the high-crisis group of ADS Infection and the Important Intermediary of ADS.
摘要目前流動(dòng)人口既為感染艾滋病病毒的高危人群，又為艾滋病擴散的重要媒介。
