中国是世界上独一无二的同时建造三套3g通讯网络的国家。

China is the world's only country that constructs three 3g communication networks simultaneously.

youdao

中国是世界上独一无二的同时建造三套3g通讯网络的国家。

China is the world's only country that constructs three 3g communication networks simultaneously.

youdao