The number of wavecrests and wave troughs of the flame varies regularly with the change of frequences of incoming waves.
火苗的波峰和波谷数目随入射声波的频率改变而有规律的变化。
2
If intermittent small scale breaking is occurring, the average energy density is limited by conditions near the long wavecrests.
如果间歇性的小尺度破碎正在发生，平均能量密度就要受到长波波峰附近状况的限制。
3
In the lab, researchers can create the impression of sending light faster than the speed limit by tweaking the speed at which the wavecrests of light propagate through space.