biconcave

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A1 初級

adj.形容詞雙凹

影片字幕

血細胞系 (Blood cell lineages)

08:04

血細胞系 (Blood cell lineages)

which are biconcave in shape.

鏡片的歷史和科學 (The History and Science of Lenses)

25:28

鏡片的歷史和科學 (The History and Science of Lenses)

was an achromatic doublet, cementing a biconvex element of crown glass with a biconcave element