The great speed of light explained why when we turn on a lamp in a dark room, the lamp and everything else in the room seem to light up at once.是什么意思_The great speed of light explained why when we turn on a lamp in a dark room, the lamp and everything else in the room seem to light up at once.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句