高龄高危高难度
high-risk and elderly patient
高危高龄
dangerous and older patients
高危生物污染环境
high-danger biological contaminated environment
冠心病高危险群
Coronary artery disease high-risk population
洪灾高危险区
high dangerous region of flood disaster
前列腺癌高危险群
prostatic cancer high risk men
禽流感高危险职业机构
Enterprises in which the workers have a high risk