The infinite "past" all regards "now" as its end, and the infinite "future" has its origin as "now". The "past" and "future" have the "now" as their succession, and they will continue forever , and become the reality of the beginning and the end. As soon as the current bell, the future of the infinite past echoes. This is the reason why the past, future is all present. The present is the history of the past, the past is the early stage of the present. The future is created by the present. Everything you do now will have a good or bad impact on the future.

Time is an eternal philosophical topic.I want to try to explain the understanding of this subject through the gear linkage mechanism.

Time is indivisible and we are always closely connected on the time scale.