... Keep Silent while Eating吃饭的时分不要说话 Telescope and Magnifier望远镜和放大镜 Plaster the Book给书上药 ...
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放大镜和望远镜的放大倍数也都是依照这个标准距离来确定的。
The magnification factor for magnifiers and telescopes depends on the reference distance.
主要产品有望远镜、天文望远镜、夜视仪、放大镜、显微镜、指南针等各种光学器材和配件。
The main product has telescope, astronomical telescope, night vision, magnifier, microscope, compass etc., are various to optical device and accessions.
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