diffraction grating英 [dəˈfrækʃən ˈɡreɪtɪŋ]美 [dəˈfrækʃən ˈɡreɪtɪŋ]衍射光栅;绕射光栅医学化学英英释义nounoptical device consisting of a surface with many parallel grooves in itSynonym:grating双语例句