Some sources emit only certain wavelengths and produce an emission spectrum of Bright lines with dark spaces Between. Such line spectra are characteristic of the elements that emit the radiation.是什么意思_Some sources emit only certain wavelengths and produce an emission spectrum of Bright lines with dark spaces Between. Such line spectra are characteristic of the elements that emit the radiation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句