Earlier mobile phones used analogue signals which emitted higher power signals than the later digital models.

早期的移动电话使用模拟信号，他比后来的数字信号手机发射出功率更强的信号。

youdao

Earlier mobile phones used analogue signals which emitted higher power signals than the later digital models.

早期的移动电话使用模拟信号，他比后来的数字信号手机发射出功率更强的信号。

youdao