A GPRS device, which resembles a modem with an extended AT command set, must define a context using an AT command before it enters data mode.是什么意思_A GPRS device, which resembles a modem with an extended AT command set, must define a context using an AT command before it enters data mode.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句