Even developing countries have access to some of these available upgrades due to exponential decreases in price.

由于价格呈指数级下降，即使是发展中国家也可以获得其中一些可用的升级。

And it’s an exponential decrease — if you go from 1 to 2 meters away from the router, the signal is only a quarter as strong, and at 3 meters it’s only a ninth as strong.

而且呈指数级下降——如果您距离路由器 1 米到 2 米，信号强度只有四分之一，而在 3 米处信号强度只有九分之一。