translation.en: I'll give you an example -- if you take a horseshoe crab off the beach, and you fly it all the way across the continent, and you drop it into a sloped cage, it will scramble up the floor of the cage as the tide is rising on its home shores, and it'll skitter down again right as the water is receding thousands of miles away.
translation.zh: 举个例子。 如果你从海滩上抓一只鲎， 把它空运到大陆的另一端， 接着把它放入一个倾斜的笼子里， 在它数千里外家乡的海岸 涨潮的时候， 它会爬到笼子的高处。 而退潮时它又会 退回笼子底部。