If you access the Internet through a modem connected to a dial-up telephone line then the connection is negotiated using the Point-to-Point Protocol (PPP).是什么意思_If you access the Internet through a modem connected to a dial-up telephone line then the connection is negotiated using the Point-to-Point Protocol (PPP).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句