al·ter·na·tion /ˌɔltɚ/
 交互,輪流,隔一個


 alternation
 交變; 交替


 alternation
 交變 交替


 Al·ter·na·tion n.
 1. The reciprocal succession of things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and night, cold and heat, summer and winter, hope and fear.
 2. Math. Permutation.
 3. The response of the congregation speaking alternately with the minister.
 Alternation of generation. See under Generation.

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 alternation
      n 1: being regularly exchangeable
      2: successive change from one thing or state to another and
         back again