| 词汇 | alternate |
| 词根词缀 | 词源： alternate (adj.) 1510s, from L. alternatus "one after the other," pp. of alternare "to do first one thing, then the other," from alternus "every other," from alter "the other" (see alter). The verb is recorded from c.1600; the noun meaning "a substitute" is first attested 1848. Alternate means "by turns;" alternative means "offering a choice." Both imply two kinds or things. 词根记忆： a. 交替的,轮流的v.(使)交替,(使)轮流The tilted salt filters halt alternately for altering.倾斜的盐过滤器交替地停下以便改造. |
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