Since the new times, some armies writers have started to change their visions to the servicemen and extend their brushwork to a case of the whole servicemen and the depth of the human nature.
新时期以来，军旅作家开始把目光转向军人自身，把笔触伸向军人群体的个案和人性深处。
The axcion can produce a non-diffracting beam, and it is used to extend depth of field of optical imaging system, and the theorem of this method is analyzed in this paper.
利用轴锥镜能产生无衍射光的特性，分析了将其应用到成像系统中增大景深的原理。
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