alternately

副词 adv.
中文释义
英 [ɔːlˈtɜɹnətlɪ]|/ɔlˈtə(ɹ)nətliː/    美 /ˈɔl.tɚ.nət.li/

英文释义

副词 adv.
  1. In reciprocal succession; succeeding by turns; in alternate order. not-comparable
    — Driving downtown is restricted to bikes with odd and even license plate numbers alternately by day of the month.
  2. By alternation; when, in a proportion, the antecedent term is compared with antecedent, and consequent. not-comparable
  3. Alternatively. Canada,US,not-comparable,proscribed,sometimes
    — Downstairs, he was informed. That is, down the escalators, where there is both a women’s room (often with a line) and a men’s room (almost never with a line). Or alternately, he could ask the station master to buzz him into the “family” bathroom. He opted to go downstairs.

词源

Etymology tree
English alternate
Middle English -ly
English -ly
English alternately
From alternate + -ly.
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