In fact, the natural world is organized hierarchically upwards, not downwards, but upwards, and we begin with a self-regulating, semi-autonomous unit called a cell.
自然界是自下向上的 一层一层发展起来的， 不是自上向下，而是自下而上。 我们首先有了一些能够自我控制、 半自主的单位，称为细胞。