The keypad is a vestige of the rotary dial, which itself is an artefact of the switch from human operators to direct-dialling in the 1920s.是什么意思_The keypad is a vestige of the rotary dial, which itself is an artefact of the switch from human operators to direct-dialling in the 1920s.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句