How can we really let go of its meaning?
The sentence "How can you really let go" means * * never really let go of anything * *. In the context of this sentence, Li Hongzhang feels that he has been doing things all his life, whether training troops or the navy, like a tiger made of paper. Although he hardly paints, he is only superficial and has not really achieved the goal of letting go of his hands and feet to deal with things.