What do you mean, a mayfly is a drop in the ocean?

Compare your own existence to a mayfly, and put your tiny existence in the vast world and the sea. "It's a drop in the ocean to send ephemera to heaven and earth" comes from the Song Dynasty writer Su Shi's Red Cliff Fu, which means that (we) are like ephemera in the vast world, a drop in the ocean, as small as a drop in the ocean. Sending ephemera into the sky and into the earth is a drop in the ocean, which means that (we) are as small as ephemera and as small as a drop in the ocean in the vast world. I put my feelings about my insignificant life and my thoughts about the brevity of life on the brevity of life.