1. aircraft supported by its own buoyancy. 
   由自身浮力支持的航空器。
2. To move with lightness and buoyancy. 
   轻快活泼地移动
3. The state or quality of being light; buoyancy. 
   轻重量轻的状态或性质；浮力
4. kinematical theory and dynamical theory 
   动力论与运动论
5. particle theory and wave theory 
   微粒说与波动说

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• 1. 浮力学说
  浮箱 buoyancy theory...浮力学说 center of buoyancy...浮心 centre of buoyancy
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