they can only travel in straight lines.

它们只能走直线
And the answer to that, I think all of you know,

解决办法你们都知道的
is to have a bunch of satellites,

通过一组卫星
three of them in particular, forming a nice triangle,

一般是三个组成一个三角
and if you can talk to this satellite from where you are,

如果你的所在地可以与这个卫星通信
that satellite, with the help of the other two,

这个卫星就可以通过另外两颗的帮助
can always see any other point you want, just by bouncing off.

经由反射让你联系到任意别的位置
Okay, you bounce off this,

你从这里反射
you can go there and you can hit this guy.

信后达到那里再传送到这个位置
So, if you have three satellites,

如果有三颗卫星
they can help you connect any point on the Earth to any other point

你就可以通过卫星的反射
by reflecting off the satellites.

在地球上任意点联系到任意其它点