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... been very low.
The most famous example in the future would be the LZT large telescope at the University of British Columbia:
It possesses a super large 6m diameter liquid mirror, currently the largest in the world.
In his past life, before Xu Yun ventured into writing, he had participated in the design of a certain domestic liquid parabolic mirror, which at that time was considered a national-level project.
The mirror, with a diameter of several meters, cost less ...
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