standard ruler
Third-person singular simple present indicative form of purge
Alternative form of keratose
(astronomy) Any astronomical object of known diameter whose distance can then be calculated from the angle it subtends
(ophthalmology) A concretion of material in a lacrymal or nasal duct.
天文学者たちは宇宙の尺度を測定するために、既知の直径を持つ天体として遠方の銀河団を利用した。
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