How does the reaction principle work?
反作用原理是如何起作用的呢?
There is evidence that the reaction principle was applied practically well before the rocket was invented.
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。
The discovery of the reaction principle represents one of the great milestones in the history of scientific thought.
在科学思想史上,反作用力原理的发现是一座伟大的丰碑。
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