alternationn.
英 ,ɔːltə'neɪʃən | 美 ,ɔltɚ'neʃən
中文n. 交替，轮流，间隔
词根词源
alternation (n.)mid-15c., from Old French alternacion, from Latin alternationem (nominative alternatio), noun of action from past participle stem of alternare (see alternate (v.)).
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