The change of emission spectra in Y_2O_2S:Sm~(3+),Mg~(2+),Ti~(4+)and Y_2O_2S:Tb~(3+),Mg~(2+),Ti~(4+) were studied though altering the concentration of activator.是什么意思_The change of emission spectra in Y_2O_2S:Sm~(3+),Mg~(2+),Ti~(4+)and Y_2O_2S:Tb~(3+),Mg~(2+),Ti~(4+) were studied though altering the concentration of activator.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句