1. The theory and practice of navigating, especially the charting of a course for a ship or an aircraft. 
   航行术航行的理论或实践，尤其是船或飞行的航行图
2. kinematical theory and dynamical theory 
   动力论与运动论
3. particle theory and wave theory 
   微粒说与波动说
4. phlogiston theory and oxidation theory 
   燃素说与氧化说
5. make slender or appear to be slender. 
   使苗条或看起来苗条。

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• 1. 细长船体理论
  slender piece 细长工件...slender ship theory 细长船体理论...slender 瘦长型的
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