1. The state or quality of being light; buoyancy. 
   轻重量轻的状态或性质；浮力
2. principal axis of inertia 
   惯量主轴
3. A nonrigid, buoyant airship. Modern blimps use helium instead of hydrogen to maintain buoyancy. 
   软式小飞艇软式浮飞艇。现代软式小飞艇，利用氦取代氢来保持浮力
4. The upward force of a liquid is called buoyancy, which can keep some objects up. 
   液体向上的力称为浮力，它能使某些物体不沉下去。
5. Of, relating to, or affecting one axis. 
   单轴的属于、有关或影响一个轴的

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• 1. 浮心轴
  axis of an orbit 轨道轴...axis of buoyancy 浮心轴...axis of channel 航道中线
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