The optical properties of GaN, AlN and AlGaN grown on sapphire substrates were investigated by means of transmittance and reflectance measurements.是什么意思_The optical properties of GaN, AlN and AlGaN grown on sapphire substrates were investigated by means of transmittance and reflectance measurements.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句