circuit-switched voice service电路: circuit; electric circuit; e ...交换: exchange; swap; interchange; ...语言: language业务: vocational work; professiona ...电路交换业务: circuit switching service下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:电路交换语言业务，即可在微信中查询翻译
