Introduction - If you have any usage issues, please Google them yourself
Analog clock, starting at 0 time of 0.1 seconds. And lift a variety of actions have to consume a certain unit of time (denoted t), For example: someone out of the elevator every 40t test time, the absence of people in and out, and then closed close and open the door each 20t each individuals out of the elevator 25t if the elevator is in a layer of stationary time more than 300t, then drove back a layer Hou life.