signal ·noun (WAVE)

Definition: a series of light waves or sound waves which are sent to a radio, television, mobile phone, etc. Level: B2

我在这里收不到手机信号。

I can't get a phone ___signal here.

另一方面，你可能会遇到信号传输的问题。

On the other hand you can face problems with ___signal transmission.

这个地区的电视信号很弱。

The television ___signal is weak in this area.