短語詞組短語wave crest and trough 波峰及波谷dicrotic wave trough 重搏波谷long -wave trough [氣象]長波槽short wave trough 短波槽long wave trough 長波槽wave trough with motor stroboscope 水波槽頻閃儀deep wave -form trough plate 深波槽長彎板trough wave 槽波seismic prospecting through trough wave 槽波地震勘探 返回 wave trough