Impeller-type flowmeter in the years of practical application, its working principle is relatively simple, general talk about is the principle of angular momentum of fluid flow measuring device.
多年来，叶轮式流量计在许多领域得到了较多的实际应用，其工作原理比较简单，概括的讲就是应用流体动量矩原理测量流量的装置。
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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