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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

2. • 釋義

   n.

   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