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。
虚的部分是一些建筑分隔，比如填充墙、栏杆、阳台、加建部分，材料用的是镂空铝板，其纹样就是九角星的多样组合。
The imaginary part is some construction space, such as the filler wall, railing, balcony, build parts, materials with hollow aluminum plate, various combination of the pattern is nine star.
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).
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.
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