calculated risk
noun [ C ] uk/ˌ ˈkæl.kjʊ.leɪ.tɪd ˈrɪsk/ us/ˌkæl.kjʊ.leɪ.t̬ɪd ˈrɪsk/
值得冒的风险
a risk that you consider worth taking because the result, if it is successful, will be so good
The director took a calculated risk in giving the film's main role to an unknown actor. 导演甘愿冒险让一位不知名的演员担任影片的主角。