| 单词 | graded series |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔continuous variation〕Variation within a population in which a graded series of intermediate phenotypes falls between the extremes.连续变异：在一个种群的两个极端之间产生的一系列杂交改良的中间型生物群体变异美国传统The children are learning to read using a graded series of books (= a series of books in which the level of difficulty gradually increases).孩子们使用阶梯读物来学习阅读。剑桥国际 |
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