| 词汇 | progression |
| 词根词缀 | 词源： c.1440, "action of moving forward," from O.Fr. progression (1425), from L. progressionem (nom. progressio) "a going forward," from progressus, pp. of progredi "go forward," from pro- "forward" + gradi "to step, walk," from gradus "step" (see grade). |
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