Always be on guard, outsmart your enemies and the environment around you. There is no room for error.,Reasonableness is the first thing an underground worker should consider, as Comrade "Zhu Lin" instructed and Cheng Qianfan always kept in mind.,He clutched his ticket pouch tightly, his gaze piercing as he scrutinized every passenger up and down. "Tickets for those boarding!" he shouted from his perch.。