| 词汇 | abacus |
| 词源 | abacus. Our name for this incredibly efficient instrument, which a skilled person can operate as fast and as accurately as an adding machine, is from the Greek abax, meaning a tablet for ciphering. The abacus was invented by the Chinese, but they call the beaded ciphering machine a suan pan, which is the source for the Japanese abacus called the soroban. |
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