线动量与角动量原理。
如果从物理学角度来讲解释这些原理有点晦涩难懂，那么在过去的两周内也许你也花费了大量的时间观看了角动量原则的实际演示--至少如果你观看了冬奥会比赛。
If the physics seems a bit arcane, consider that you probably spent much of the past two weeks seeing the angular-momentum principle in action — at least if you watched the Olympics.
角动量守恒，惯量，平行轴原理。
Conservation of angular momentum, moment of inertia, parallel axis theorem.
角动量守恒，惯量，平行轴原理。
Conservation of angular momentum, moment of inertia, parallel axis theorem.
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