在山上的信号不好。

Zài shān shàng de xìnhào bù hǎo.

The signal on the mountain is not good.

天文台刚发出了暴风信号。

Tiānwéntái gāng fāchū le bàofēng xìnhào.

The waether observatory just issued a storm signal.

这个地区的手机信号很差。

Zhège dìqū de shǒujī xìnhào hěn chà.

The mobile signal in this area is very weak.