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单词 focoid
释义 focoid|ˈfəʊkɔɪd|
[f. foc-us + -oid.]
One of the points in which every circle in a given plane meets the line at infinity in that plane.
1881C. Taylor Geom. Conics 308 The two focoids or circular points at infinity.
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更新时间:2024/12/22 11:46:19