And the bottom has the same iPod connector on it, which lets us plug in a cable.

而在底部，也有和iPod一样的接口，可以让我们插入连接线。

One recent guess put that at 2.5 billion possibly habitable planets, so let's plug in 4%.

最近的一项猜测认为可能有 25 亿颗宜居行星，所以让我们代入 4%。