risk形容词risky；
riskyadj.有危险(或风险)的；
例如It was a risky operation, but might buy more time
Buying a second-hand car can be a risky business.
买二手车可能有风险。
Horse breeding is indeed a risky enterprise.
养马确实是个有风险的营生。
The case against is twofold too risky and too expensive.
反对理由有两点太冒险而且太昂贵。
