It concerns the spheres of the normal alarming device, telephone system and so on.Meanwhile it covers the application of single chip and DTMF.是什么意思_It concerns the spheres of the normal alarming device, telephone system and so on.Meanwhile it covers the application of single chip and DTMF.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句