Each emitting diode is punctual to emit the infrared light signal in turn from the right diode to the left one which has a modulated frequency of 40 kHz.是什么意思_Each emitting diode is punctual to emit the infrared light signal in turn from the right diode to the left one which has a modulated frequency of 40 kHz.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句