Sundt and Teugels(1995) considered the ultimate ruin probability in a compound Poisson model with a constant interest force, and they get its exact solution at the special case of exponential claim sizes. Sundt和Teugels(1995)研究了常利率下复合泊松模型的终极破产概率，而且在个别理赔额服从指数分布的特殊情形下，他们还得到了终极破产概率的显式解。
By taking a constant interest in his son's progress, he helped to keep him on the rails. 他经常关心儿子的进步，促使儿子遵守法律和习俗。
The Renewal Risk Model with Constant Interest Force 常利率下的更新风险模型
By taking a constant interest in his son's progress,he helped to keep him on the rails. 他经常关心儿子的进步，促使儿子遵守法律和习俗。
His wife was a constant inspiration to him. 他的妻子经常鼓励他。