| 单词 | bead-frame |
| 释义 | > as lemmasbead-frame bead-frame n. a frame containing beads strung upon wires used for teaching numeration, an abacus. ΘΚΠ the world > relative properties > number > mathematical instruments > [noun] > arithmetical instrument > abacus abacus1686 suan-pan1736 bead-frame1858 soroban1891 counting-frame1920 1858 Curwen Singing for Sch. Introd. 20 Till the pupil..is able to perform some of its [arithmetic] simpler operations by the help of the Bead-Frame or the Box of various Objects. < as lemmas |
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