By the end of 1880, Edison had produced a 16-watt bulb with a special carbonized cotton filament that could last 1,500 hours.是什么意思_By the end of 1880, Edison had produced a 16-watt bulb with a special carbonized cotton filament that could last 1,500 hours.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句