Time is a measure. The physical definition is scalar. By time, the sequence of events can be determined by the sequence of past-present-future, and the duration of the event and the interval between events and the interval. -Wikipedia Time allows us to remember the fragments of the event, so that we can learn lessons and learn from experience. An experience, an event is summarized in a period of time, people in the same group are suitable for a sign of sincerity, we call it: revolutionary emotions!