虚角和毛角不应是一个东西，犀牛角应为毛角，即表皮角。而牛羊角为虚角，即洞角。表皮角完全由表皮角质层的毛状角质纤维所组成，无骨质成分，为犀科所特有。
微分散射截面的变化主要依赖于相对介电常数实部、虚部数值较大的一方，并且随粒子取向角的增大而增大。
The variation of DSCS depends on the larger part between real part and imaginary part of dielectric coefficient. The DSCS and azimuth angle are in proportional relation.
为了处理波场的真实3D特性（其中包括宽方位角和重影入射角），发明了三维虚反射剔除方法。
To handle the true 3D nature of the wavefield, including the wide azimuths and large take-off angles of the ghosts, a 3D deghosting method was developed.
位于古村落东南角的玉虚观，建于金代金大定十八年(1178年)。
Located in the southeast corner of the ancient village of Yu Xu Guan, built in the Jin Dynasty Dading eighteen years (1178).
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