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echelon ['eʃə'lɔn]    添加到生词本 复制网址
基本释义
  • n. 梯形,梯阵,梯次编队
    vt. 排成梯队
    vi. 形成梯队
英英解释
  •  2个名词解释

    1. a body of troops arranged in a line
    2. a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset