| 单词 | gradation |
| 例句 | gradation noun 1.•a gradation of ability:range, scale, spectrum, span | progression, hierarchy, ladder, pecking order. 2.•each of the bands has a number of color gradations within it:level, grade, rank, position, status, stage, standard, echelon, rung, step, notch | class, stratum, group, grouping, set. |
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