When an acoustic beam, limited both in time and space, radiated from liquid to a plane lipuid solid interface, we observed the nonspecular reflection phenomena (the reflected beam has a fixed reflected angle in some range of incident angle).

• 当时间·空间上有限的声束入射到液固平界时，我们观察到非镜面反射现象（即在一定入射角范围内有一个以固定角反射的反射波）。