Both areas are practically significant as real world problems have very often both continuous and discrete variables and have elements of uncertainty that need to be addressed in a tractable manner.

• 这两个领域在实际应用中都有着非常重要的意义。因为现实世界通常都同时有连续和离散变量，并有着不确定的元素，这需要转换成易处理的模式。