And when they do that, it leaves less room on the wireless spectrum, the radio waves that these technologies use are limited.

当他们这样做时，就会在无线频谱上留下更少的空间，这些技术使用的无线电波是有限的。

And when they do that, it leaves less room on the wireless spectrum, [and]the radio waves that these technologies use are limited.

当他们这样做时，无线频谱上的空间就会减少，这些技术使用的无线电波也会受到限制。