反作用原理是如何起作用的呢？
有证据证明，这种反作用原理在火箭发明前就得到了很好的实际应用。
There is evidence that the reaction principle was applied practically well before the rocket was invented.
本文首先采用虚功原理建立了反作用轮的扰动解析模型，然后给出了反作用轮的实验模型。
In this paper, an analytical model is firstly set up using virtual work principle, an empirical model is then given.
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