There-wavelengths can be multi/demultiplexed by using two photonic crystals directional couplers which are connected sequentially.是什么意思_There-wavelengths can be multi/demultiplexed by using two photonic crystals directional couplers which are connected sequentially.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句