What impression does the word 'iron' give you? Do you remember Zhao Chuan'sThere is a sentence in "I am ugly, but I am gentle" that goes, "Every morning in front of the bathroom mirror, I find myself living on the edge of a razor, in the jungle of steel and concrete, calculating the gap between my dreams and reality in the hustle and bustle of life." It evokes a gray and cold feeling in people's minds, only a cold and lifeless silence.