Instead of the solid block of glass of the prism in pentaprism system, here 3 simple mirrors are used to perform the same task.

五镜不是用一整个玻璃棱镜，而是用3块镜子来达到目。

A method is also presented for calculating the side area and volume of critical rocks with arbitrary pentahedron as example.

以任意五为例,介绍了危石、计算方法。

The pentahedral bicharacteristic curve grid can be applied to investigate the thrust misalignment characteristics in a unsteady flow.

证明五双特徵曲线网格方法可用来研究非定常流动条件下推力偏心特性。