動(dòng) （開(kāi)展； 發(fā)揮） spread out，develop，amplify；形 （多余） redundant，superfluous；名 low and smooth land，hillside，marsh ；
[例句] 色澤是反射和衍射的綜合效果. Lustre is the integral effect of reflection and diffraction.
[例句] 在這種情況下,據(jù)說(shuō),波發(fā)生了衍射. In this case the wave is said to have been diffracted.