1. fluctuation of boundary layer pressure 
   附面层压力起伏
2. Gradual erosion; a gradual slope. 
   逐渐地腐蚀；缓坡
3. gradual and sudden change 
   渐变与突变
4. stop of gradual advancing process 
   渐进过程的中断
5. firm and dependable; subject to little fluctuation. 
   稳固的且可靠的；不遭受波动或起伏的。

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• 1. 渐次的波动
  gain fluctuation 增益波动, 增益起伏...gradual fluctuation 渐次的波动...interference fluctuation of sound 声干涉的起伏现象
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