| 词汇 | summation |
| 词根词缀 | 词源： 1760, from Mod.L. summationem (nom. summatio) "an adding up," from L.L. summatus, pp. of summare "to sum up," from L. summa (see sum). 词根记忆： n. 总数(summ+ation)[sum,summ=add up,表示"总,加"] |
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