As a key device in a DWDM system, etching diffraction grating(EDG) is a planar waveguide DWDM device with a great potential.是什么意思_As a key device in a DWDM system, etching diffraction grating(EDG) is a planar waveguide DWDM device with a great potential.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句