And they migrated into the rest of the world at two kilometers per year until, within several tens of thousands of years, we occupied every single watershed on the planet and became the most dominant species, with a very small amount of technology.
彼らは一年に２キロメートルの速度で 地球全体に移住を続け 何万年もの間に 人は地球上すべての流域を占領し 非常にわずかのテクノロジーを使って