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Naked eye
01
裸の目
the human eye unaided by any optical device, used for observing objects and details directly
例
With the naked eye, you can see the texture and color of the fabric.
The stars are visible to the naked eye on a clear night sky.
He inspected the machinery with the naked eye before using diagnostic tools.
The mountain range stretched out far beyond what could be discerned with the naked eye.
The infinitesimal crack in the glass was barely visible to the naked eye.
