Weighing five tons and boasting three horns, 它体重五吨♥ 长有三只角
its stability also supported dinosaurs of every shape and size. 地球的稳定 也支撑了各种形状和大小的恐龙
and periods of almost endless rain. 以及几乎无休止的降雨期
Competition, both within and between species, 物种内及物种间的竞争
And the most acute competition comes from one's own kind. 最激烈的竞争来自同类
The rise and fall of these dynasties, over four billion years, 40多亿年来 这些王朝的兴衰