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单词 θ64759
释义
the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > qualities of (1)
light grasp1869

the amount of light that can enter a telescope, binoculars, or other optical device at any instant; light-gathering power.

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更新时间:2026/6/8 23:35:23