Translation of "Signal" in Chinese

Catch a signal.

收到一個信號。

He gave us the signal to begin.

他給了我們信號讓我們開始。

- The traffic signal is green.
- The light is green.

現在是綠燈。

An increase in customer complaints could signal a decline in business.

顧客投訴量增加，可能代表生意正在走下坡。

What are you saying? I cannot hear, the signal here is too bad.

你说什么？我听不见，这里信号太差了。