... 双透镜目镜 two-lens ocular 双透镜物镜 two-lens objective 双透镜组系统 duplet lens system ...
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There is no overall objective difference between the two lens families.
在二者的镜头群之间在客观上没有全面的不同。
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That is, the compound objective lens has two focal points.
因而,复合透镜有两个焦点。
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