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unseeable
例
The microscopic organisms were unseeable without the aid of a powerful microscope.
The unseeable wiring inside the walls was responsible for the power outage.
The hidden patterns in the data were unseeable in the raw figures but became apparent through statistical analysis.
Certain wavelengths of light are unseeable to humans, requiring special sensors to detect.
The subtle defects in the material were unseeable to the naked eye but detected through advanced imaging.
