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单词 θ80905
释义
the world > matter > light > transparency or translucence > [noun] > tool to determine transparency (1)
Secchi('s) disc1913

Secchi('s) disc: a type of opaque white disc which is used in determining the transparency of water; the disc, maintained in a horizontal attitude…

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更新时间:2025/2/4 0:58:03