这个山区的通讯条件比较差，经常没有信号。

Zhè gè shānqū de tōngxùn tiáojiàn bǐjiào chà, jīngcháng méiyǒu xìnhào.

The communication conditions in this mountainous area are poor; there's often no signal.

为了保证通讯安全，公司给每位员工配发了加密手机。

Wèile bǎozhèng tōngxùn ānquán, gōngsī gěi měi wèi yuángōng pèifā le jiāmì shǒujī.

To ensure communication security, the company issued encrypted phones to every employee.

现在的通讯工具非常发达，我们可以随时联系朋友。

Xiànzài de tōngxùn gōngjù fēicháng fādá, wǒmen kěyǐ suíshí liánxì péngyou.

Modern communication tools are very advanced; we can contact friends anytime.