Aided by the two virtual images of the seam light source on the seam plane observed at the back of the prism, it can reach the systematic coaxis by regulating them to symmetrize the seam.

本文借助于在棱镜后面所观察到的在缝平面上的缝光源之二虚像，并通过把它们调至对缝严格对称，迅速达到系统的共轴要求。

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Additionally, a light source imitating the sky has been placed outside the virtual greenhouse.

另外，光源代表虚拟温室外的天空。

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