risk model的用法和樣例：
例句
- An over-reliance on unseasoned risk models is also partly to blame for bad underwriting.
對不成熟的風險模型過度依賴是導致不良承銷的部分原因。 - At last we obtain the supremum estimation of the finite time ruin probability and the infinite time ruin probability in the third new risk model.
對第三類風險模型進行研究，得到了有限時間破產概率和終極時間破產概率的上界估計。
