The paper used acoustic detection method; tested the horizontal pipeline and undulating pipeline in single-phase and two-phase flow situations, and gained the corresponding acoustic signals.
本文采用声学检测的方法，对水平管和起伏管在单相气体和两相流体的情况分别进行了测试，得到了相应的声波信号。
So you've been working on a nice, undulating breaststroke... getting your body to ride up and down and flow through the water.
你一直在练习好看的波蛙：使你的身体忽上忽下顺水滑行。
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