In life-long love, life refers to life, and love refers to the fate of love between men and women, so life-long love refers to the feelings and fate of life.
Among the poems expressing the love of a lifetime are: the love of a lifetime is like flying snow, like looking at the autumn moon with a sword. If life is just like the first time, you don't have to draw a fan in the autumn wind. A moment that should last forever has come and gone before I know it. Once I tasted the vast sea, I felt that the water in other places was pale; Once you have experienced the clouds in Wushan, you feel that the clouds elsewhere are eclipsed.