What does it mean to look back on the emptiness in Mu Ran today?

Still look at the meaning of today: look at today's people. Looking back suddenly means looking back suddenly and inadvertently. Describe what a person has experienced and reproduce it in his mind.

Looking back suddenly means:

Careless, I suddenly remembered that my mind was in a mess. It also means suddenly discovering, suddenly understanding, and suddenly understanding; It means to look back suddenly or suddenly and inadvertently. What I experienced came back to my mind. Both idioms contain feelings of looking back on the past and feeling profusely.