Shown is a locking interface assembly that facilitates the integration of a commercial Long Gun Barrel tube with an existing gun mount of a conventional Tank. A set of electronic mail messages is accumulated to form a continuous electronic mail message block. The method includes determining positions of clock markings using the analog clock implementation module for the analog clock around the display unit; acquiring the display mode of the analog clock; displaying the current time in the analog clock, acquiring and displaying display contents together with the analog clock in the display mode.