Each telephone key has its own tone.
每个电话键都有不同的音调。
The key equipment which joins the telephone and data network is gateways.
连接电话与数据网的关键设备就是网关。
The telephone is a key vehicle in international business communication in modern society.
电话是国际商务交流信息进行联络的良好媒介。
The telephone is a key vehicle in international business communication in modern society.
电话是国际商务交流信息进行联络的良好媒介。
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