risk variable

• 危险变量；危险因素

risk variable的用法和样例：

例句

1. Obesity is a major risk factor for sleep apnea.
   肥胖是呼吸暂停的主要危险因素。
2. Obesity and lack of exercise are chief risk factors.
   肥胖和缺乏锻炼是主要的危险因素。