continuous wave cavity ring-down连续波光腔衰荡
Continuous-wave cavity ring-down连续波腔衰荡法
continuous-wave cavity ring-down technology连续波腔衰荡技术
down going wave下行波
period-down-wave周期下降波
V（动词） to signal with a wave to (a driver or vehicle) to stop 挥手叫(司机或汽车)停车