| 单词 | undulation |
| 释义 | undulation (once / 3566 pages) n Undulation is a flowing, up-and-down movement like the motion of waves. Have you ever looked out over the ocean and watched the water flow up and down in waves? If so, you watched undulation, which is exactly that type of movement. Undulation best applies to waves, but it can also describe similar movements. If dancers are moving in a flowing manner, that's also undulation. The verb form of this word is undulate, and both come from the Latin word for "wave," unda. WORD FAMILYundulation: undulations+/undulate: undulated, undulates, undulating, undulatingly, undulation, undulatory USAGE EXAMPLESWhether or not “Live by Night” succeeds, Affleck is at peace with the undulations of his Hollywood career. Seattle Times(Dec 22, 2016) Gaze at all two hours of its mysterious patterns and undulations. The Guardian(Nov 09, 2016) Not even the final throes of a presidential election whose undulations grow wilder by the day made him nostalgic for this. New York Times(Oct 18, 2016) 1n wavelike motion; a gentle rising and falling in the manner of waves Hyper motion, movement a natural event that involves a change in the position or location of something 2n (physics) a movement up and down or back and forth Syn|Hypo|Hyper wave gravitation wave, gravity wave (physics) a wave that is hypothesized to propagate gravity and to travel at the speed of light sine wavea wave whose waveform resembles a sine curve oscillation, vibration(physics) a regular periodic variation in value about a mean fluctuationa wave motion seichea wave on the surface of a lake or landlocked bay; caused by atmospheric or seismic disturbances standing wave, stationary wavea wave (as a sound wave in a chamber or an electromagnetic wave in a transmission line) in which the ratio of its instantaneous amplitude at one point to that at any other point does not vary with time traveling wave, travelling wavea wave in which the medium moves in the direction of propagation of the wave acoustic wave, sound wave(acoustics) a wave that transmits sound wave form, wave shape, waveformthe shape of a wave illustrated graphically by plotting the values of the period quantity against time blast wave, shock wavea region of high pressure travelling through a gas at a high velocity impulse, pulsation, pulse, pulsing(electronics) a sharp transient wave in the normal electrical state (or a series of such transients) flap, flapping, flutter, flutteringthe motion made by flapping up and down ripple(electronics) an oscillation of small amplitude imposed on top of a steady value solitary wave, soliton, soliton wave(physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance; does not obey the superposition principle and does not dissipate air wavea sound wave that is transmitted via air transient(physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load sonic booman explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound beata single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations resonancea vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system sympathetic vibration(physics) vibration produced by resonance motion, movement a natural event that involves a change in the position or location of something 3n an undulating curve Syn|Hypo|Hyper wave sine curve, sinusoid the curve of y=sin x curve, curved shape the trace of a point whose direction of motion changes |
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