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英语解释

up-and-down

音标['ʌpən'daun]

汉语翻译

a. 一上一下的, 时起时伏的

up-and-down英语解释

副词 up-and-down:

  1. moving backward and forward along a given course
    同义词:up and down
  2. alternately upward and downward
    同义词:up and down
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