| 词汇 | echelon |
| 词根词缀 | 词源： 1796, from Fr. échelon "level, echelon," lit. "rung of a ladder," from O.Fr. eschelon, from eschiele "ladder," from L.L. scala "stair, slope," from L. scalæ (pl.) "ladder, steps." Originally "step-like arrangement of troops," sense of "level, subdivision" is from WWI. |
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