| 词汇 | quadruple |
| 词根词缀 | 词源： quadruple (v.) late 14c., from L. quadruplare "make fourfold," from quadruplus (n.) "quadruple," from quadri- "four" + -plus "fold." Quadruplets "four children in one birth" is first recorded 1787. The abbreviation of it to quad is first attested 1851. |
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