缩小镜；使物体看起来变小的透镜
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缩小镜；使物体看起来变小的透镜；缩小镜；使物体看起来变小的透镜
a lens that makes objects appear smaller than they actually are
The engraver used a reducing glass to check the smaller version of the design.
雕刻师用缩小镜来检查图案的缩小版本。
缩小镜；使物体看起来变小的透镜
a lens that makes objects appear smaller than they actually are
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