Always be on guard, outsmart your enemies and the environment around you. There is no room for error.,When Cheng Qianfan took the tram at that time, Lao Liao pretended to get on the tram. The two would have contact at this moment, secretly and quickly completing the transmission of information or items.,As a train ticket collector, I had a good vantage point and developed hawk-like vision. I could see and remember every man, woman, and child who boarded the train.。