risk 做动词 有1) risk sth.(risk one's life) 2）risk doing
做名词 1）at risk 处境危险 2）at the risk of 冒着神马的危险 3）take the risk （of）doing岁这句话应该是那个答案呢？我觉得是take the risk of their lives to rescue后面to do 是动词不定式表目的