"The evacuation channel on the northeast side of the executive lounge is blocked and has not been rectified. The system prompts warning." On September 21, Sun Gang, security manager of Wanda Vista Hotel in Yantai City, Shandong Province, saw this supervisory notice and immediately organized relevant personnel to rectify the situation. . After the rectification of the hidden danger, Sun Gang's mobile phone received the rectified photos, showing that the rectification of the hidden danger has been completed.