| 单词 | line-pair |
| 释义 | > as lemmasline-pair line-pair n. Π 1867 A. Cayley in Coll. Math. Papers (1893) VI. 201 A conic is a curve of the second order and second class; quà curve of the second order it may degenerate into a pair of lines, or line-pair. < as lemmas |
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