时空平移

My old classmates, the physician Ye Hehua and couple Yici invent time machine and go back to ancient time. If life goes back to a million years ago, the biosphere evolves one million years accordingly, so is does the civilization. After that, Ye Hehua goes to the future of 80 thousand years. He finds that the leader of planetary migration is the descendent of Yici and me while he himself will be died at the time he traverses the future. For the course of human history, he starts time machine again...