"A long, long time ago, there were no mountains, no trees, and nothing but a sea, a boundless sea.""Not even grandpa?" asked the squirrel. "Hehe, no, not even the grandfather's grandfather." The old tree said, "The day when I first grew out of the ground, oh, that was a long way off, and that day was already three hundred feet long from me. Now, I used to be a seed, I used to be a seedling, not half the height of a leaf..." The old tree fell into a long memory, "Which year was that? There are...