undulate

v.波动，形成波浪

undies, undignified, undirected, undischarged, undisclosed, undiscovered, undisputed, undistinguished, undisturbed, undivided, undo, undoing, undone, undoubted, undoubtedly, undreamed-of, undress, undressed, undrinkable, undue, undulation, unduly, undying, unearned, unearth, unearthly, unease, uneasily, uneasiness, uneasy, uneatable, uneconomic, uneconomical, uneconomically, unedited, uneducated, unemloyment, unemployed, unemployment, unemployment benefit,