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.

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。

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I'll give it a little bit more spin angular momentum, so now I move my left hand towards me and my...

我再给它多一点的角动量，现在我将我的左手朝我移动。

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So, let me get a little bit more specific about what we mean by nodal plane and where the idea of nodal plane comes from, and nodal planes arise from any place you have angular nodes.

关于节面的意义，或者节面概念的起源，让我们讲的更具体一点，节面起源于角向节点。

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Even when it first appeared, the brightly colored angular landscapes looked a bit dated and the bulky headsets looked more like a hood dryer at a hairdressing salon than a cutting edge piece of technology.

CNN: Turning virtual visions into reality

Starting with the F3, the mirrorless camera has lost a smidgen of the curves found on its older sibling, the C3, adopting a slight bit of the angular edges that once made the NEX-7 the badass standout in the lineup.

ENGADGET: Sony's Alpha A37 and NEX-F3 pose for the camera, reveal more angles, details

From the banks, our boat must have looked a bit like some floating cubist sculpture, its white angular structure scored by floor-to-ceiling windows striped with balcony railings, its monochromatic figure floating in a backdrop of clear blue sky.

BBC: Safari by water in southern Africa