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  1. Oxford American Dictionary

    undulation

    • IPA[ˌənjəˈlāSHən]

    美式

    • n.
      the action of moving smoothly up and down；a smoothly rising and falling form, outline, or movement

    • noun: undulation, plural noun: undulations

    • 釋義

    名詞

    • 1. the action of moving smoothly up and down the soft undulation of the waves animates the scene
    • ▪ a smoothly rising and falling form, outline, or movement the road follows the undulations of the countryside
    • 更多解釋

    undulation

    • IPA[ˌʌndjʊˈleɪʃn]

    英式

    • n.
      the action of moving smoothly up and down: the soft undulation of the waves animates the scene

    Oxford Dictionary