... 半涂银面镜 Half-Silvered Mirrors 激光面镜 Laser Mirrors 天文用面镜 Astronomical Mirrors ...
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Use of mirrors is for astronomical telescopes. They are designed and fabricated to perform excellently for that purpose and in that environment only.
镜是用作天文用途，设计及磨装均以履行此为目的及在该个环境时是为最佳。
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